class Range

Parent:
Object
Included modules:
Enumerable

A Range represents an interval—a set of values with a beginning and an end. Ranges may be constructed using the s..e and s...e literals, or with ::new. Ranges constructed using .. run from the beginning to the end inclusively. Those created using ... exclude the end value. When used as an iterator, ranges return each value in the sequence.

(-1..-5).to_a      #=> []
(-5..-1).to_a      #=> [-5, -4, -3, -2, -1]
('a'..'e').to_a    #=> ["a", "b", "c", "d", "e"]
('a'...'e').to_a   #=> ["a", "b", "c", "d"]

Custom Objects in Ranges

Ranges can be constructed using any objects that can be compared using the <=> operator. Methods that treat the range as a sequence (#each and methods inherited from Enumerable) expect the begin object to implement a succ method to return the next object in sequence. The step and include? methods require the begin object to implement succ or to be numeric.

In the Xs class below both <=> and succ are implemented so Xs can be used to construct ranges. Note that the Comparable module is included so the == method is defined in terms of <=>.

class Xs                # represent a string of 'x's
  include Comparable
  attr :length
  def initialize(n)
    @length = n
  end
  def succ
    Xs.new(@length + 1)
  end
  def <=>(other)
    @length <=> other.length
  end
  def to_s
    sprintf "%2d #{inspect}", @length
  end
  def inspect
    'x' * @length
  end
end

An example of using Xs to construct a range:

r = Xs.new(3)..Xs.new(6)   #=> xxx..xxxxxx
r.to_a                     #=> [xxx, xxxx, xxxxx, xxxxxx]
r.member?(Xs.new(5))       #=> true

Public Class Methods

json_create(object) Show source
# File ext/json/lib/json/add/range.rb, line 9
def self.json_create(object)
  new(*object['a'])
end

Deserializes JSON string by constructing new Range object with arguments a serialized by to_json.

new(begin, end, exclude_end=false) → rng Show source
static VALUE
range_initialize(int argc, VALUE *argv, VALUE range)
{
    VALUE beg, end, flags;

    rb_scan_args(argc, argv, "21", &beg, &end, &flags);
    range_modify(range);
    range_init(range, beg, end, RBOOL(RTEST(flags)));
    return Qnil;
}

Constructs a range using the given begin and end. If the exclude_end parameter is omitted or is false, the rng will include the end object; otherwise, it will be excluded.

Public Instance Methods

rng == obj → true or false Show source
static VALUE
range_eq(VALUE range, VALUE obj)
{
    if (range == obj)
        return Qtrue;
    if (!rb_obj_is_kind_of(obj, rb_cRange))
        return Qfalse;

    return rb_exec_recursive_paired(recursive_equal, range, obj, obj);
}

Returns true only if obj is a Range, has equivalent begin and end items (by comparing them with ==), and has the same exclude_end? setting as the range.

(0..2) == (0..2)            #=> true
(0..2) == Range.new(0,2)    #=> true
(0..2) == (0...2)           #=> false
rng === obj → true or false Show source
static VALUE
range_eqq(VALUE range, VALUE val)
{
    return rb_funcall(range, rb_intern("include?"), 1, val);
}

Returns true if obj is an element of the range, false otherwise. Conveniently, === is the comparison operator used by case statements.

case 79
when 1..50   then   print "low\n"
when 51..75  then   print "medium\n"
when 76..100 then   print "high\n"
end

produces:

high
as_json(*) Show source
# File ext/json/lib/json/add/range.rb, line 15
def as_json(*)
  {
    JSON.create_id  => self.class.name,
    'a'             => [ first, last, exclude_end? ]
  }
end

Returns a hash, that will be turned into a JSON object and represent this object.

begin → obj Show source
static VALUE
range_begin(VALUE range)
{
    return RANGE_BEG(range);
}

Returns the object that defines the beginning of the range.

(1..10).begin   #=> 1
bsearch {|obj| block } → value Show source
static VALUE
range_bsearch(VALUE range)
{
    VALUE beg, end;
    int smaller, satisfied = 0;

    /* Implementation notes:
     * Floats are handled by mapping them to 64 bits integers.
     * Apart from sign issues, floats and their 64 bits integer have the
     * same order, assuming they are represented as exponent followed
     * by the mantissa. This is true with or without implicit bit.
     *
     * Finding the average of two ints needs to be careful about
     * potential overflow (since float to long can use 64 bits)
     * as well as the fact that -1/2 can be 0 or -1 in C89.
     *
     * Note that -0.0 is mapped to the same int as 0.0 as we don't want
     * (-1...0.0).bsearch to yield -0.0.
     */

#define BSEARCH_CHECK(val) \
    do { \
        VALUE v = rb_yield(val); \
        if (FIXNUM_P(v)) { \
            if (FIX2INT(v) == 0) return val; \
            smaller = FIX2INT(v) < 0; \
        } \
        else if (v == Qtrue) { \
            satisfied = 1; \
            smaller = 1; \
        } \
        else if (v == Qfalse || v == Qnil) { \
            smaller = 0; \
        } \
        else if (rb_obj_is_kind_of(v, rb_cNumeric)) { \
            int cmp = rb_cmpint(rb_funcall(v, id_cmp, 1, INT2FIX(0)), v, INT2FIX(0)); \
            if (!cmp) return val; \
            smaller = cmp < 0; \
        } \
        else { \
            rb_raise(rb_eTypeError, "wrong argument type %s" \
                " (must be numeric, true, false or nil)", \
                rb_obj_classname(v)); \
        } \
    } while (0)

#define BSEARCH(conv) \
    do { \
        RETURN_ENUMERATOR(range, 0, 0); \
        if (EXCL(range)) high--; \
        org_high = high; \
        while (low < high) { \
            mid = ((high < 0) == (low < 0)) ? low + ((high - low) / 2) \
                : (low < -high) ? -((-1 - low - high)/2 + 1) : (low + high) / 2; \
            BSEARCH_CHECK(conv(mid)); \
            if (smaller) { \
                high = mid; \
            } \
            else { \
                low = mid + 1; \
            } \
        } \
        if (low == org_high) { \
            BSEARCH_CHECK(conv(low)); \
            if (!smaller) return Qnil; \
        } \
        if (!satisfied) return Qnil; \
        return conv(low); \
    } while (0)


    beg = RANGE_BEG(range);
    end = RANGE_END(range);

    if (FIXNUM_P(beg) && FIXNUM_P(end)) {
        long low = FIX2LONG(beg);
        long high = FIX2LONG(end);
        long mid, org_high;
        BSEARCH(INT2FIX);
    }
#if SIZEOF_DOUBLE == 8 && defined(HAVE_INT64_T)
    else if (RB_TYPE_P(beg, T_FLOAT) || RB_TYPE_P(end, T_FLOAT)) {
        int64_t low  = double_as_int64(RFLOAT_VALUE(rb_Float(beg)));
        int64_t high = double_as_int64(RFLOAT_VALUE(rb_Float(end)));
        int64_t mid, org_high;
        BSEARCH(int64_as_double_to_num);
    }
#endif
    else if (is_integer_p(beg) && is_integer_p(end)) {
        VALUE low = rb_to_int(beg);
        VALUE high = rb_to_int(end);
        VALUE mid, org_high;
        RETURN_ENUMERATOR(range, 0, 0);
        if (EXCL(range)) high = rb_funcall(high, '-', 1, INT2FIX(1));
        org_high = high;

        while (rb_cmpint(rb_funcall(low, id_cmp, 1, high), low, high) < 0) {
            mid = rb_funcall(rb_funcall(high, '+', 1, low), id_div, 1, INT2FIX(2));
            BSEARCH_CHECK(mid);
            if (smaller) {
                high = mid;
            }
            else {
                low = rb_funcall(mid, '+', 1, INT2FIX(1));
            }
        }
        if (rb_equal(low, org_high)) {
            BSEARCH_CHECK(low);
            if (!smaller) return Qnil;
        }
        if (!satisfied) return Qnil;
        return low;
    }
    else {
        rb_raise(rb_eTypeError, "can't do binary search for %s", rb_obj_classname(beg));
    }
    return range;
}

By using binary search, finds a value in range which meets the given condition in O(log n) where n is the size of the range.

You can use this method in two use cases: a find-minimum mode and a find-any mode. In either case, the elements of the range must be monotone (or sorted) with respect to the block.

In find-minimum mode (this is a good choice for typical use case), the block must return true or false, and there must be a value x so that:

  • the block returns false for any value which is less than x, and

  • the block returns true for any value which is greater than or equal to x.

If x is within the range, this method returns the value x. Otherwise, it returns nil.

ary = [0, 4, 7, 10, 12]
(0...ary.size).bsearch {|i| ary[i] >= 4 } #=> 1
(0...ary.size).bsearch {|i| ary[i] >= 6 } #=> 2
(0...ary.size).bsearch {|i| ary[i] >= 8 } #=> 3
(0...ary.size).bsearch {|i| ary[i] >= 100 } #=> nil

(0.0...Float::INFINITY).bsearch {|x| Math.log(x) >= 0 } #=> 1.0

In find-any mode (this behaves like libc's bsearch(3)), the block must return a number, and there must be two values x and y (x <= y) so that:

  • the block returns a positive number for v if v < x,

  • the block returns zero for v if x <= v < y, and

  • the block returns a negative number for v if y <= v.

This method returns any value which is within the intersection of the given range and x…y (if any). If there is no value that satisfies the condition, it returns nil.

ary = [0, 100, 100, 100, 200]
(0..4).bsearch {|i| 100 - ary[i] } #=> 1, 2 or 3
(0..4).bsearch {|i| 300 - ary[i] } #=> nil
(0..4).bsearch {|i|  50 - ary[i] } #=> nil

You must not mix the two modes at a time; the block must always return either true/false, or always return a number. It is undefined which value is actually picked up at each iteration.

cover?(obj) → true or false Show source
static VALUE
range_cover(VALUE range, VALUE val)
{
    VALUE beg, end;

    beg = RANGE_BEG(range);
    end = RANGE_END(range);
    if (r_le(beg, val)) {
        if (EXCL(range)) {
            if (r_lt(val, end))
                return Qtrue;
        }
        else {
            if (r_le(val, end))
                return Qtrue;
        }
    }
    return Qfalse;
}

Returns true if obj is between the begin and end of the range.

This tests begin <= obj <= end when exclude_end? is false and begin <= obj < end when exclude_end? is true.

("a".."z").cover?("c")    #=> true
("a".."z").cover?("5")    #=> false
("a".."z").cover?("cc")   #=> true
each {| i | block } → rng Show source
each → an_enumerator
static VALUE
range_each(VALUE range)
{
    VALUE beg, end;

    RETURN_SIZED_ENUMERATOR(range, 0, 0, range_enum_size);

    beg = RANGE_BEG(range);
    end = RANGE_END(range);

    if (FIXNUM_P(beg) && FIXNUM_P(end)) { /* fixnums are special */
        long lim = FIX2LONG(end);
        long i;

        if (!EXCL(range))
            lim += 1;
        for (i = FIX2LONG(beg); i < lim; i++) {
            rb_yield(LONG2FIX(i));
        }
    }
    else if (SYMBOL_P(beg) && SYMBOL_P(end)) { /* symbols are special */
        VALUE args[2];

        args[0] = rb_sym_to_s(end);
        args[1] = EXCL(range) ? Qtrue : Qfalse;
        rb_block_call(rb_sym_to_s(beg), rb_intern("upto"), 2, args, sym_each_i, 0);
    }
    else {
        VALUE tmp = rb_check_string_type(beg);

        if (!NIL_P(tmp)) {
            VALUE args[2];

            args[0] = end;
            args[1] = EXCL(range) ? Qtrue : Qfalse;
            rb_block_call(tmp, rb_intern("upto"), 2, args, each_i, 0);
        }
        else {
            if (!discrete_object_p(beg)) {
                rb_raise(rb_eTypeError, "can't iterate from %s",
                         rb_obj_classname(beg));
            }
            range_each_func(range, each_i, 0);
        }
    }
    return range;
}

Iterates over the elements of range, passing each in turn to the block.

The each method can only be used if the begin object of the range supports the succ method. A TypeError is raised if the object does not have succ method defined (like Float).

If no block is given, an enumerator is returned instead.

(10..15).each {|n| print n, ' ' }
# prints: 10 11 12 13 14 15

(2.5..5).each {|n| print n, ' ' }
# raises: TypeError: can't iterate from Float
end → obj Show source
static VALUE
range_end(VALUE range)
{
    return RANGE_END(range);
}

Returns the object that defines the end of the range.

(1..10).end    #=> 10
(1...10).end   #=> 10
eql?(obj) → true or false Show source
static VALUE
range_eql(VALUE range, VALUE obj)
{
    if (range == obj)
        return Qtrue;
    if (!rb_obj_is_kind_of(obj, rb_cRange))
        return Qfalse;
    return rb_exec_recursive_paired(recursive_eql, range, obj, obj);
}

Returns true only if obj is a Range, has equivalent begin and end items (by comparing them with eql?), and has the same exclude_end? setting as the range.

(0..2).eql?(0..2)            #=> true
(0..2).eql?(Range.new(0,2))  #=> true
(0..2).eql?(0...2)           #=> false
exclude_end? → true or false Show source
static VALUE
range_exclude_end_p(VALUE range)
{
    return EXCL(range) ? Qtrue : Qfalse;
}

Returns true if the range excludes its end value.

(1..5).exclude_end?     #=> false
(1...5).exclude_end?    #=> true
first → obj Show source
first(n) → an_array
static VALUE
range_first(int argc, VALUE *argv, VALUE range)
{
    VALUE n, ary[2];

    if (argc == 0) return RANGE_BEG(range);

    rb_scan_args(argc, argv, "1", &n);
    ary[0] = n;
    ary[1] = rb_ary_new2(NUM2LONG(n));
    rb_block_call(range, idEach, 0, 0, first_i, (VALUE)ary);

    return ary[1];
}

Returns the first object in the range, or an array of the first n elements.

(10..20).first     #=> 10
(10..20).first(3)  #=> [10, 11, 12]
hash → fixnum Show source
static VALUE
range_hash(VALUE range)
{
    st_index_t hash = EXCL(range);
    VALUE v;

    hash = rb_hash_start(hash);
    v = rb_hash(RANGE_BEG(range));
    hash = rb_hash_uint(hash, NUM2LONG(v));
    v = rb_hash(RANGE_END(range));
    hash = rb_hash_uint(hash, NUM2LONG(v));
    hash = rb_hash_uint(hash, EXCL(range) << 24);
    hash = rb_hash_end(hash);

    return LONG2FIX(hash);
}

Compute a hash-code for this range. Two ranges with equal begin and end points (using eql?), and the same exclude_end? value will generate the same hash-code.

See also Object#hash.

include?(obj) → true or false Show source
static VALUE
range_include(VALUE range, VALUE val)
{
    VALUE beg = RANGE_BEG(range);
    VALUE end = RANGE_END(range);
    int nv = FIXNUM_P(beg) || FIXNUM_P(end) ||
             linear_object_p(beg) || linear_object_p(end);

    if (nv ||
        !NIL_P(rb_check_to_integer(beg, "to_int")) ||
        !NIL_P(rb_check_to_integer(end, "to_int"))) {
        if (r_le(beg, val)) {
            if (EXCL(range)) {
                if (r_lt(val, end))
                    return Qtrue;
            }
            else {
                if (r_le(val, end))
                    return Qtrue;
            }
        }
        return Qfalse;
    }
    else if (RB_TYPE_P(beg, T_STRING) && RB_TYPE_P(end, T_STRING) &&
             RSTRING_LEN(beg) == 1 && RSTRING_LEN(end) == 1) {
        if (NIL_P(val)) return Qfalse;
        if (RB_TYPE_P(val, T_STRING)) {
            if (RSTRING_LEN(val) == 0 || RSTRING_LEN(val) > 1)
                return Qfalse;
            else {
                char b = RSTRING_PTR(beg)[0];
                char e = RSTRING_PTR(end)[0];
                char v = RSTRING_PTR(val)[0];

                if (ISASCII(b) && ISASCII(e) && ISASCII(v)) {
                    if (b <= v && v < e) return Qtrue;
                    if (!EXCL(range) && v == e) return Qtrue;
                    return Qfalse;
                }
            }
        }
    }
    /* TODO: ruby_frame->this_func = rb_intern("include?"); */
    return rb_call_super(1, &val);
}

Returns true if obj is an element of the range, false otherwise. If begin and end are numeric, comparison is done according to the magnitude of the values.

("a".."z").include?("g")   #=> true
("a".."z").include?("A")   #=> false
("a".."z").include?("cc")  #=> false
inspect → string Show source
static VALUE
range_inspect(VALUE range)
{
    return rb_exec_recursive(inspect_range, range, 0);
}

Convert this range object to a printable form (using inspect to convert the begin and end objects).

last → obj Show source
last(n) → an_array
static VALUE
range_last(int argc, VALUE *argv, VALUE range)
{
    if (argc == 0) return RANGE_END(range);
    return rb_ary_last(argc, argv, rb_Array(range));
}

Returns the last object in the range, or an array of the last n elements.

Note that with no arguments last will return the object that defines the end of the range even if exclude_end? is true.

(10..20).last      #=> 20
(10...20).last     #=> 20
(10..20).last(3)   #=> [18, 19, 20]
(10...20).last(3)  #=> [17, 18, 19]
max → obj Show source
max {| a,b | block } → obj
max(n) → obj
max(n) {| a,b | block } → obj
static VALUE
range_max(int argc, VALUE *argv, VALUE range)
{
    VALUE e = RANGE_END(range);
    int nm = FIXNUM_P(e) || rb_obj_is_kind_of(e, rb_cNumeric);

    if (rb_block_given_p() || (EXCL(range) && !nm) || argc) {
        return rb_call_super(argc, argv);
    }
    else {
        VALUE b = RANGE_BEG(range);
        int c = rb_cmpint(rb_funcall(b, id_cmp, 1, e), b, e);

        if (c > 0)
            return Qnil;
        if (EXCL(range)) {
            if (!FIXNUM_P(e) && !rb_obj_is_kind_of(e, rb_cInteger)) {
                rb_raise(rb_eTypeError, "cannot exclude non Integer end value");
            }
            if (c == 0) return Qnil;
            if (!FIXNUM_P(b) && !rb_obj_is_kind_of(b,rb_cInteger)) {
                rb_raise(rb_eTypeError, "cannot exclude end value with non Integer begin value");
            }
            if (FIXNUM_P(e)) {
                return LONG2NUM(FIX2LONG(e) - 1);
            }
            return rb_funcall(e, '-', 1, INT2FIX(1));
        }
        return e;
    }
}

Returns the maximum value in the range. Returns nil if the begin value of the range larger than the end value.

Can be given an optional block to override the default comparison method a <=> b.

(10..20).max    #=> 20
member?(obj) → true or false Show source
static VALUE
range_include(VALUE range, VALUE val)
{
    VALUE beg = RANGE_BEG(range);
    VALUE end = RANGE_END(range);
    int nv = FIXNUM_P(beg) || FIXNUM_P(end) ||
             linear_object_p(beg) || linear_object_p(end);

    if (nv ||
        !NIL_P(rb_check_to_integer(beg, "to_int")) ||
        !NIL_P(rb_check_to_integer(end, "to_int"))) {
        if (r_le(beg, val)) {
            if (EXCL(range)) {
                if (r_lt(val, end))
                    return Qtrue;
            }
            else {
                if (r_le(val, end))
                    return Qtrue;
            }
        }
        return Qfalse;
    }
    else if (RB_TYPE_P(beg, T_STRING) && RB_TYPE_P(end, T_STRING) &&
             RSTRING_LEN(beg) == 1 && RSTRING_LEN(end) == 1) {
        if (NIL_P(val)) return Qfalse;
        if (RB_TYPE_P(val, T_STRING)) {
            if (RSTRING_LEN(val) == 0 || RSTRING_LEN(val) > 1)
                return Qfalse;
            else {
                char b = RSTRING_PTR(beg)[0];
                char e = RSTRING_PTR(end)[0];
                char v = RSTRING_PTR(val)[0];

                if (ISASCII(b) && ISASCII(e) && ISASCII(v)) {
                    if (b <= v && v < e) return Qtrue;
                    if (!EXCL(range) && v == e) return Qtrue;
                    return Qfalse;
                }
            }
        }
    }
    /* TODO: ruby_frame->this_func = rb_intern("include?"); */
    return rb_call_super(1, &val);
}

Returns true if obj is an element of the range, false otherwise. If begin and end are numeric, comparison is done according to the magnitude of the values.

("a".."z").include?("g")   #=> true
("a".."z").include?("A")   #=> false
("a".."z").include?("cc")  #=> false
min → obj Show source
min {| a,b | block } → obj
min(n) → array
min(n) {| a,b | block } → array
static VALUE
range_min(int argc, VALUE *argv, VALUE range)
{
    if (rb_block_given_p()) {
        return rb_call_super(argc, argv);
    }
    else if (argc != 0) {
        return range_first(argc, argv, range);
    }
    else {
        VALUE b = RANGE_BEG(range);
        VALUE e = RANGE_END(range);
        int c = rb_cmpint(rb_funcall(b, id_cmp, 1, e), b, e);

        if (c > 0 || (c == 0 && EXCL(range)))
            return Qnil;
        return b;
    }
}

Returns the minimum value in the range. Returns nil if the begin value of the range is larger than the end value.

Can be given an optional block to override the default comparison method a <=> b.

(10..20).min    #=> 10
size → num Show source
static VALUE
range_size(VALUE range)
{
    VALUE b = RANGE_BEG(range), e = RANGE_END(range);
    if (rb_obj_is_kind_of(b, rb_cNumeric) && rb_obj_is_kind_of(e, rb_cNumeric)) {
        return ruby_num_interval_step_size(b, e, INT2FIX(1), EXCL(range));
    }
    return Qnil;
}

Returns the number of elements in the range. Both the begin and the end of the Range must be Numeric, otherwise nil is returned.

(10..20).size    #=> 11
('a'..'z').size  #=> nil
(-Float::INFINITY..Float::INFINITY).size #=> Infinity
step(n=1) {| obj | block } → rng Show source
step(n=1) → an_enumerator
static VALUE
range_step(int argc, VALUE *argv, VALUE range)
{
    VALUE b, e, step, tmp;

    RETURN_SIZED_ENUMERATOR(range, argc, argv, range_step_size);

    b = RANGE_BEG(range);
    e = RANGE_END(range);
    if (argc == 0) {
        step = INT2FIX(1);
    }
    else {
        rb_scan_args(argc, argv, "01", &step);
        if (!rb_obj_is_kind_of(step, rb_cNumeric)) {
            step = rb_to_int(step);
        }
        if (rb_funcall(step, '<', 1, INT2FIX(0))) {
            rb_raise(rb_eArgError, "step can't be negative");
        }
        else if (!rb_funcall(step, '>', 1, INT2FIX(0))) {
            rb_raise(rb_eArgError, "step can't be 0");
        }
    }

    if (FIXNUM_P(b) && FIXNUM_P(e) && FIXNUM_P(step)) { /* fixnums are special */
        long end = FIX2LONG(e);
        long i, unit = FIX2LONG(step);

        if (!EXCL(range))
            end += 1;
        i = FIX2LONG(b);
        while (i < end) {
            rb_yield(LONG2NUM(i));
            if (i + unit < i) break;
            i += unit;
        }

    }
    else if (SYMBOL_P(b) && SYMBOL_P(e)) { /* symbols are special */
        VALUE args[2], iter[2];

        args[0] = rb_sym_to_s(e);
        args[1] = EXCL(range) ? Qtrue : Qfalse;
        iter[0] = INT2FIX(1);
        iter[1] = step;
        rb_block_call(rb_sym_to_s(b), rb_intern("upto"), 2, args, sym_step_i, (VALUE)iter);
    }
    else if (ruby_float_step(b, e, step, EXCL(range))) {
        /* done */
    }
    else if (rb_obj_is_kind_of(b, rb_cNumeric) ||
             !NIL_P(rb_check_to_integer(b, "to_int")) ||
             !NIL_P(rb_check_to_integer(e, "to_int"))) {
        ID op = EXCL(range) ? '<' : idLE;
        VALUE v = b;
        int i = 0;

        while (RTEST(rb_funcall(v, op, 1, e))) {
            rb_yield(v);
            i++;
            v = rb_funcall(b, '+', 1, rb_funcall(INT2NUM(i), '*', 1, step));
        }
    }
    else {
        tmp = rb_check_string_type(b);

        if (!NIL_P(tmp)) {
            VALUE args[2], iter[2];

            b = tmp;
            args[0] = e;
            args[1] = EXCL(range) ? Qtrue : Qfalse;
            iter[0] = INT2FIX(1);
            iter[1] = step;
            rb_block_call(b, rb_intern("upto"), 2, args, step_i, (VALUE)iter);
        }
        else {
            VALUE args[2];

            if (!discrete_object_p(b)) {
                rb_raise(rb_eTypeError, "can't iterate from %s",
                         rb_obj_classname(b));
            }
            args[0] = INT2FIX(1);
            args[1] = step;
            range_each_func(range, step_i, (VALUE)args);
        }
    }
    return range;
}

Iterates over the range, passing each nth element to the block. If begin and end are numeric, n is added for each iteration. Otherwise step invokes succ to iterate through range elements.

If no block is given, an enumerator is returned instead.

range = Xs.new(1)..Xs.new(10)
range.step(2) {|x| puts x}
puts
range.step(3) {|x| puts x}

produces:

 1 x
 3 xxx
 5 xxxxx
 7 xxxxxxx
 9 xxxxxxxxx

 1 x
 4 xxxx
 7 xxxxxxx
10 xxxxxxxxxx

See Range for the definition of class Xs.

to_json(*args) Show source
# File ext/json/lib/json/add/range.rb, line 25
def to_json(*args)
  as_json.to_json(*args)
end

Stores class name (Range) with JSON array of arguments a which include first (integer), last (integer), and exclude_end? (boolean) as JSON string.

to_s → string Show source
static VALUE
range_to_s(VALUE range)
{
    VALUE str, str2;

    str = rb_obj_as_string(RANGE_BEG(range));
    str2 = rb_obj_as_string(RANGE_END(range));
    str = rb_str_dup(str);
    rb_str_cat(str, "...", EXCL(range) ? 3 : 2);
    rb_str_append(str, str2);
    OBJ_INFECT(str, range);

    return str;
}

Convert this range object to a printable form (using to_s to convert the begin and end objects).

Ruby Core © 1993–2017 Yukihiro Matsumoto
Licensed under the Ruby License.
Ruby Standard Library © contributors
Licensed under their own licenses.