Quick Intro to Arrays in JavaScript

Arrays

• get first item in an array: array[0]
• get last item in an array: array[array.length-1]
• add item to end: array.push(val) can push multiple values
• add item to beginning: array.unshift(val)
• remove item from end: array.pop() returns the last item from an array and removes it
• remove item from start: array.shift() returns the first item from an array and removes it
• Join elements in an array: .join()
• Join two Arrays: .concat()
• Search arrays: indexOf()

Loops for Arrays

1for( var i=0; i<arr.length; i += 1) {
2	console.log(arr[i]);
3}

Do note that using for loops are the ancient way of doing things. You should be using cool higher order functions like .map and .reduce