Learning JavaScript Data Structures and Algorithms

Control structures

JavaScript has a similar set of control structures as the C and Java languages. Conditional statements are supported by if…else and switch. Loops are supported by while, do…while, and for constructs.

Conditional statements

The first conditional statement we will take a look at is the if…else construct. There are a few ways we can use the if…else construct.

We can use the if statement if we want to execute a script only if the condition is true:

var num = 1;
if (num === 1) {
    console.log("num is equal to 1");
} 

We can use the if…else statement if we want to execute a script if the condition is true or another script just in case the condition is false (else):

var num = 0; if (num === 1) { console.log("num is equal to 1"); } else { ...