iterate through list javascript

<script> 
index = 0; 
array = [ 1, 2, 3, 4, 5, 6 ]; 
  
array.forEach(myFunction); 
function myFunction(item, index) 
{ 
    console.log(item); 
}</script>

const array = ["one", "two", "three"]
array.forEach(function (item, index) {
  console.log(item, index);
});

var colors = ["red","blue","green"];
for (var i = 0; i < colors.length; i++) {
    console.log(colors[i]);
}

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

/* ES6 */
const cities = ["Chicago", "New York", "Los Angeles"];
cities.map(city => {
	console.log(city)
})

const array = ["hello", "world"];

for (item of array) {
	//DO THIS
}

let numbers = [1,2,3,4,5];
let numbersLength = numbers.length;
for ( let i = 0; i < numbersLength; i++) {
    console.log (numbers[i]);
}