array.select {|item| block } → an_array

Invokes the block passing in successive elements from array, returning an array containing those elements for which the block returns a true value (equivalent to Enumerable#select).

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

Source Code

/*
*  call-seq:
*     array.select {|item| block } -> an_array
*  
*  Invokes the block passing in successive elements from <i>array</i>,
*  returning an array containing those elements for which the block
*  returns a true value (equivalent to <code>Enumerable#select</code>).
*     
*     a = %w{ a b c d e f }
*     a.select {|v| v =~ /[aeiou]/}   #=> ["a", "e"]
*/

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

   result = rb_ary_new2(RARRAY(ary)->len);
   for (i = 0; i < RARRAY(ary)->len; i++) {
       if (RTEST(rb_yield(RARRAY(ary)->ptr[i]))) {
           rb_ary_push(result, rb_ary_elt(ary, i));
       }
   }
   return result;
}