Method: Enumerable#grep

Defined in:
enum.c

#grep(pattern) ⇒ Array #grep(pattern) {|obj| ... } ⇒ Array

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.

(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]

Overloads:

  • #grep(pattern) ⇒ Array

    Returns:

  • #grep(pattern) {|obj| ... } ⇒ Array

    Yields:

    • (obj)

    Returns:



88
89
90
91
92
93
94
95
96
97
 
# File 'enum.c', line 88

static VALUE
enum_grep(VALUE obj, VALUE pat)
{
    VALUE ary = rb_ary_new();
    NODE *memo = NEW_MEMO(pat, ary, 0);

    rb_block_call(obj, id_each, 0, 0, rb_block_given_p() ? grep_iter_i : grep_i, (VALUE)memo);

    return ary;
}