var 12 var 99 console log for var length push Math pow for var in push

var a = [5, 12]; 
var b = []; 
a[99] = 7; 
console.log (a); 
for(var i = 0; i <= a.length; i++){ 	
	b.push(Math.pow(a[i], 2)); 
} 
for(var k in a){ 	
	b.push(Math.pow(a[k], 2)); 
} 
console.log (b);