JavaScript Conditional Statements

We use conditional statements to perform different actions for different decisions. In JavaScript, we have following conditional statements.

  • 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
  • Use else if to specify a new condition to test, if the first condition is false
  • Use switch to specify many alternative blocks of code to be executed

 

The if Statement

You can use the if statement to specify a block of JavaScript code to be executed if a condition is true.

Syntax

if (condition) {
    a block of code to be executed if the condition is true
}

Example

If marks of the student is more than 33 result will be pass.

if (marks > 33) {
    result = "pass";
}

The result will be:

Pass

 

The else Statement

Use the else statement to specify a block of code to be executed if the condition is false.

Syntax

if (condition) {
   
block of code to be executed if the condition is true
} else { 
   
block of code to be executed if the condition is false
}

Example

If marks of the student is more than 33 result will be pass or less than 33 fail.

if (marks > 33) {
    result = "pass";
}

else {
     result = "fail";
}

The result will be:

Fail

 

The else if Statement

Use the else if statement to specify a new condition if the first condition is false.

Syntax

if (condition1) {
    block of code to be executed if 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
}

Example:

 

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