Why do we use if/else statements?

In JavaScript, the if/else statement is known as what is called a conditional statement. Conditional statements are used to perform different actions based on different conditions.

If Statements

The “if” statement is a statement in coding that is used to instruct a block of JavaScript code to be executed if a condition is true.

Example: 

• An if statement would be written in the following format:

           if (condition) {

           // block of code to be executed if the condition is true

           }

• If you were writing a code and wanted a greeting to appear that said “Good morning!” if it was before noon, then you would write your if statement in the following format:

            if (hour < 12) {

           greeting = “Good morning!”;

           }

Else Statements

“Else” statements are used to instruct a block of code to be executed if the condition is false.

Example: 

• An else statement would be written in the following format:

          if (condition1) {

         // block of code to be executed if the condition1 is true

          } else if (condition2) {

        // block of code to be executed if the condition1 is false and condition2 is true

          } else {

        //  block of code to be executed if the condition1 is false and condition2 is false

          }

• If you were writing a code and wanted a greeting to appear that said “Good morning!” if it was before noon, “Good afternoon!” if it was after noon, but before 5:00PM (17:00), and “Good evening!” if it was after 17:00, then you would write your code in the following format: