Javascript lesson 2 The if construct

In this lesson, we will explore how the if statement can be used in JavaScript. The syntax in JavaScript is quite similar to PHP (both were designed with C++ programmers in mind), so you can also read about if statements in this PHP lesson:

PHP Lessons – Lesson 8 – If Statement

As an example, let's take a look at the following if structure:

var x = 15;
var y = 7;

if (x > y) {
  alert('x is greater than y'); // if x is greater than y
} else {
  alert('x is less than y'); // if x is not greater than y
}

The general form of an if statement is as follows:

if (condition) {
  action if the condition is true
} else {
  action if the condition is false
}