JS Bin[Array-like object]// source http://jsbin.com/kalovug

jsbin.kalovug.js

var x = {'5':'cliff', '6':'19', length:3};


var y = Array.prototype.slice.call(x);

console.log(y);
// result: [undefined, "cliff", "19"]

var a = {'0':'cliff', '1':'19', length:4};


var b = Array.prototype.slice.call(a);

console.log(b);


//result: ["cliff", "19", undefined, undefined]

Be aware of the relationship of properties in Number and its position in sliced output.

1. length property determine the output length.
2. only properties in number are indexable.