foreachloop.js

for (var i = 0; i < allImgs.length; i++)

//shorthand
for(var i in allImgs)

//cache
var i, allImgsLen = allImgs.length;
for (i = 0; i < allImgsLen i++)

//quick reverse << FAST!
var i = allImgs.length;
while(i--)

//with array
function logArrayElements(element, index, array) {
    console.log("a[" + index + "] = " + element);
}
[2, 5, 9].forEach(logArrayElements);
// logs:
// a[0] = 2
// a[1] = 5
// a[2] = 9