P.S. I know that was a bad example since that does not require a lazy
assignment, it could be performed runtime

    inArray: Array.prototype.indexOf ?
        function( elem, array ) {
            return array.indexOf(elem);
        } :
        function( elem, array ) {
            for ( var i = 0, length = array.length; i < length; i++ ) {
                if ( array[ i ] === elem )
                    return i;
            };
            return -1;
        }
    ,

It was just an example how features detection could improve performances
(and with native indexOf we know that performances are better)

Regards

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