rem: var last      = this[this.length - 1 ]; this.length   = this.length - 1; 
add: var last = null; if ( this.length > 0 ) { last = this[this.length - 1 ]; this.length = this.length - 1; } 
context:     Array.prototype.pop=function()    {        var last      = this[this.length - 1 ];        this.length   = this.length - 1;        return last;    }
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