Variables is just giving a useful name to a piece of memory. It's good to think of variables as wires pointing going from your code to a universe of JavaScript values

Functions

A function is generally a named section of code that can be "called" by name, and the code inside it will run each time.

function greetStudent(student) {
	console.log(
		`Hello, ${student.name} !`	
	);
}

function timeRemaining(timeElapsed, endTime) {
	return endTime - timeElapsed;
}

var left = timeRemaining(42,240);

left;

Learning programming is like building blocks. To build a tall tower, you start first by putting block on top of block on top of block. Some essential programming building blocks:

• You need operators to perform actions on values.
• You need values and types to perform different kinds of actions like math on numbers or output with strings.
• You need variables to store data (aka state) during your program's execution.
• You need loops to repeat tasks until a condition stops being true.
• You need functions to organize your code into logical and reusable chunks.