JavaScript if
The JavaScript if Statement
Use the JavaScript if statement to execute a block of code when a condition is true.
Syntax
if (condition) {
// block of code to be executed if the condition is true
}
Note that if is in lowercase letters. Uppercase letters (If or IF) will generate a JavaScript error.
Example
Make a "Good day" greeting if the hour is less than 18:00:
if (hour < 18) {
greeting = "Good day";
}
The result of greeting will be:
Examples
let age = 18;
let text = "You can Not drive";
if (age >= 18) {
text = "You can drive");
}
Try it Yourself »
let age = 16;
let text = "You can Not drive";
if (age >= 18) {
text = "You can drive");
}
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Nested if
You can use an if statement inside another
if statement:
Example
let age = 16;
let country = "USA";
let text = "You can Not drive!";
if (country == "USA") {
if (age >= 16) {
text = "You can drive!";
}
}
Try it Yourself »
Nested if statements can make your code more complex.
A better solution is to use the logical AND operator:
Example
let age = 16;
let country = "USA";
let text = "You can Not drive!";
if (country == "USA" && age >= 16) {
text = "You can drive!";
}
Try it Yourself »
