Test case details

Preparation Code

var a = [1, 2, 3, 4];         function Peek1(a) {        if (a.length>0) return a[a.length-1];     }         function Peek2(a) {        var n = a.length;        if (n) return a[n-1];     }         function Peek3(a) {        var n;        if (n=a.length) return a[n-1];     }

Test cases

Test #1

Peek1(a);

Test #2

Peek2(a);

Test #3

Peek3(a);