for

Available in ES 2009.

for(initialization; condition; increment) { 
    // Code to be executed 
} 

initialization - used to initialize the counter variable, and evaluated once unconditionally before the first execution of the body of the loop.
condition - evaluated at the beginning of each iteration. If it evaluates to true, the loop statements execute. If it evaluates to false, the execution of the loop ends.
increment - updates the loop counter every time the loop runs.

for (i=0; i < total; i++) { 
} 

Iterating an Array

Arrays > Loops

Iterating a Map

Arrays > Collections > Maps

Iterating a Set

Arrays > Collections > Sets