Method: Array#select

Defined in:
array.c

#select {|item| ... } ⇒ Array #select ⇒ Enumerator #filter {|item| ... } ⇒ Array #filter ⇒ Enumerator

Returns a new array containing all elements of ary for which the given block returns a true value.

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

[1,2,3,4,5].select {|num| num.even? }     #=> [2, 4]

a = %w[ a b c d e f ]
a.select {|v| v =~ /[aeiou]/ }    #=> ["a", "e"]

See also Enumerable#select.

Array#filter is an alias for Array#select.

Overloads:

  • #select {|item| ... } ⇒ Array

    Yields:

    • (item)
  • #filter {|item| ... } ⇒ Array

    Yields:

    • (item) 


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# File 'array.c', line 3212

static VALUE
rb_ary_select(VALUE ary)
{
    VALUE result;
    long i;

    RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
    result = rb_ary_new2(RARRAY_LEN(ary));
    for (i = 0; i < RARRAY_LEN(ary); i++) {
  if (RTEST(rb_yield(RARRAY_AREF(ary, i)))) {
      rb_ary_push(result, rb_ary_elt(ary, i));
  }
    }
    return result;
}