The arrow function is a new way to write anonymous function expressions introduced as part of the ECMAScript 2015 specification (ES6) of JavaScript.

Both for..of and for..in statements iterate over lists; for..in returns the index value for the specific loop and for-of gives you the value returned by the iterator implementation.

git fetch is similar to pull but doesn't automatically merge; it fetches remote updates, but your local stays the same. git pull pulls down from a remote and instantly merges with your local.

Javascript has historically been forgiving of bad syntax. "strict mode" makes several changes to standard JavaScript semantics that address this.

The CSS3 resize property controls if and how the user can resize an element by clicking and dragging the bottom right corner (on left-to-right page direction) of the element.

The CSS user-select property controls how an element's text is allowed to be selected and can be used to make text unselectable.

The main difference between using var and let is the scope and whether or not the variable is hoisted.

JavaScript variables and functions are not declared at the point of use. Instead, they are moved to the top of their scope hoisted and assigned a default value of undefined until they're reached in code.

Removing items from an array in javascript is not as simple as in some languages, but it's not hard when you know how.