method

select!

v1_9_3_392 - Show latest stable - 0 notes - Class: Array

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select!() public

Invokes the block passing in successive elements from self, deleting elements for which the block returns a false value. It returns self if changes were made, otherwise it returns nil. See also Array#keep_if

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

Show source

static VALUE
rb_ary_select_bang(VALUE ary)
{
    long i1, i2;

    RETURN_ENUMERATOR(ary, 0, 0);
    rb_ary_modify(ary);
    for (i1 = i2 = 0; i1 < RARRAY_LEN(ary); i1++) {
        VALUE v = RARRAY_PTR(ary)[i1];
        if (!RTEST(rb_yield(v))) continue;
        if (i1 != i2) {
            rb_ary_store(ary, i2, v);
        }
        i2++;
    }

    if (RARRAY_LEN(ary) == i2) return Qnil;
    if (i2 < RARRAY_LEN(ary))
        ARY_SET_LEN(ary, i2);
    return ary;
}

select!

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