The JavaScript if condition statement executes a code block if a specified condition is true. If the condition is false, then a block of code will not be executed.
if (expression) {
//Statement(s) to be executed if expression is true
}Use if to specify a block of code to be executed, if a specified condition is true. Use else to specify a block of code to be executed, if the same condition is false.
if (condition) {
// Executed if the condition is true
} else {
// Eexecuted if the condition is false
}if condition in JavaScript
Simple example code understands how the if statement works.
<!DOCTYPE html>
<html>
<body>
<script >
var age = 20;
if( age > 18 ) {
console.log("Qualifies for driving 18 <", age);
}
</script>
</body>
</html>Output:
More example
function testNum(a) {
let result;
if (a > 0) {
result = 'positive';
} else {
result = 'NOT positive';
}
return result;
}
console.log(testNum(-5)); // "NOT positive"Do comment if you have any doubts or suggestions on this JS condition statement topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version