Conditional statements are used to perform different actions based on different conditions.
Very often when you write code, you want to perform different actions for different decisions.
You can use conditional statements in your code to do this.
In JavaScript we have the following conditional statements:
Use the if statement to specify a block of JavaScript code to be executed if a condition is true.
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Note that if is in lowercase letters. Uppercase letters (If or IF) will generate a JavaScript error. |
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Make a "Good day" greeting if the time is less than 20:00:
The result of greeting will be:
Use the else statement to specify a block of code to be executed if the condition is false.
If the time is less than 20:00, create a "Good day" greeting, otherwise "Good evening":
The result of greeting will be:
Use the else if statement to specify a new condition if the first condition is false.
If time is less than 10:00, create a "Good morning" greeting, if not, but time is less than 20:00, create a "Good day" greeting, otherwise a "Good evening":
The result of greeting will be:
Random link
This example will write a link to either W3Schools or to the World Wildlife
Foundation (WWF). By using a random number, there is a 50% chance for each of the
links.
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