JavaScript If-else
The JavaScript if-else statement is used to execute code based on whether a
condition is true or false. In JavaScript, there are three different forms of
the if statement.
1. If Statement
2. If else statement
3. if else if statement
JavaScript If statement
It evaluates the content only if the expression is true. The syntax of the
JavaScript if statement is provided below.
Syntax:
if (condition) {
// code to execute if condition is true
}
Flowchart of If statement
Example
Here is a simple example of an if statement in Javascript
<Script>
let x = 10;
if (x > 5) {
console.log("x is greater than 5");
}
</Script>
JavaScript If...else Statement
It evaluates the content whether the condition is true or false. The syntax of
the JavaScript if-else statement is shown below.
Syntax:
if (condition) {
// code to execute if condition is true
} else {
// code to execute if condition is false
}
Flowchart of If else statement
Example
Let's look at an example of an if-else statement in JavaScript to determine
whether a number is even or odd.
<Script>
let num = 11;
if (num % 2 === 0) {
console.log(num + " is an even number");
} else {
console.log(num + " is an odd number");
}
</Script>
JavaScript If...else if statement
It evaluates the content only if one of several expressions is true. The
syntax of the JavaScript if else if statement is provided below.
Syntax:
if (condition1) {
// code to execute if condition1 is te
} else if (condition2) {
// code to execute if condition1 is false and condition2 is true
} else if (condition3) {
// code to execute if condition1 and condition2 are false and
condition3 is true
} else {
// code to execute if all conditions are false
}
Example
Let's look at a simple example of an if else if statement in JavaScript.
<Script>
let score = 85;
if (score >= 90) {
console.log("Grade: A");
} else if (score >= 80) {
console.log("Grade: B");
} else if (score >= 70) {
console.log("Grade: C");
} else {
console.log("Grade: F");
}
</Script>
