method

pop

Ruby latest stable (v1_8_6_287) - 1 note - Class: Array

pop() public

Removes the last element from self and returns it, or nil if the array is empty.

   a = [ "a", "m", "z" ]
   a.pop   #=> "z"
   a       #=> ["a", "m"]

Show source

/*
 *  call-seq:
 *     array.pop  -> obj or nil
 *  
 *  Removes the last element from <i>self</i> and returns it, or
 *  <code>nil</code> if the array is empty.
 *     
 *     a = [ "a", "m", "z" ]
 *     a.pop   #=> "z"
 *     a       #=> ["a", "m"]
 */

VALUE
rb_ary_pop(ary)
    VALUE ary;
{
    rb_ary_modify_check(ary);
    if (RARRAY(ary)->len == 0) return Qnil;
    if (!FL_TEST(ary, ELTS_SHARED) &&
            RARRAY(ary)->len * 2 < RARRAY(ary)->aux.capa &&
            RARRAY(ary)->aux.capa > ARY_DEFAULT_SIZE) {
        RARRAY(ary)->aux.capa = RARRAY(ary)->len * 2;
        REALLOC_N(RARRAY(ary)->ptr, VALUE, RARRAY(ary)->aux.capa);
    }
    return RARRAY(ary)->ptr[--RARRAY(ary)->len];
}

November 18, 2008

0 thanks

Pop for last, Shift for first

If you want to pop the first element instead of the last one, use shift .

pop

Related methods

Pop for last, Shift for first