method

first

v1_9_2_180 - Show latest stable - 1 note - Class: Enumerable

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1_8_7_72 (0)
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1_9_1_378 (-6)
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first(p1 = v1) public

Returns the first element, or the first n elements, of the enumerable. If the enumerable is empty, the first form returns nil, and the second form returns an empty array.

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static VALUE
enum_first(int argc, VALUE *argv, VALUE obj)
{
    VALUE n, params[2];

    if (argc == 0) {
        params[0] = params[1] = Qnil;
    }
    else {
        long len;

        rb_scan_args(argc, argv, "01", &n);
        len = NUM2LONG(n);
        if (len == 0) return rb_ary_new2(0);
        if (len < 0) {
            rb_raise(rb_eArgError, "negative length");
        }
        params[0] = len;
        params[1] = rb_ary_new2(len);
    }
    rb_block_call(obj, id_each, 0, 0, first_i, (VALUE)params);

    return params[1];
}

March 15, 2012

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Video Explanation of first, last and each

http://www.youtube.com/watch?feature=player_embedded&v=rQIJ0WJXOr8

first

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Video Explanation of first, last and each