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instance method

Enumerable#grep

enum.grep(pattern) → array

enum.grep(pattern) { |obj| block } → array

static VALUE
enum_grep(VALUE obj, VALUE pat)
{
    return enum_grep0(obj, pat, Qtrue);
}

Returns an array of every element in enum for which Pattern === element. If the optional block is supplied, each matching element is passed to it, and the block’s result is stored in the output array.

Example

(1..100).grep 38..44   #=> [38, 39, 40, 41, 42, 43, 44]
c = IO.constants
c.grep(/SEEK/)         #=> [:SEEK_SET, :SEEK_CUR, :SEEK_END]
res = c.grep(/SEEK/) { |v| IO.const_get(v) }
res                    #=> [0, 1, 2]

See also #flat_map #grep_v #first #group_by also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1

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