when to iterate in javascript code example

Example 1: javascript iterate through for loop

var myStringArray = ["Hello","World"];
var arrayLength = myStringArray.length;
for (var i = 0; i < arrayLength; i++) {
    console.log(myStringArray[i]);
    //Do something
}

Example 2: Iterate with JavaScript For Loops

var myArray = [];
for (var i = 1; i <= 5; i++){
    myArray.push(i);
} 
console.log(myArray) // console output [ 1, 2, 3, 4, 5 ]