JavaScript Ternary Operator

Ternary Operator

The “Question mark” or “conditional” operator in JavaScript is a ternary operator that has three operands. It is the simplified operator of if/else.

Examples:

Input: let result = (10 > 0) ? true : false;
Output: true
Input: let message = (20 > 15) ? "Yes" : "No";
Output: Yes

Syntax:

condition ? value if true : value if false

• condition: Expression to be evaluated which returns a boolean value.
• value if true: Value to be executed if the condition results in a true state.
• value if false: Value to be executed if the condition results in a false state.

Characteristics of Ternary Operator

• The expression consists of three operands: the condition, value if true, and value if false.
• The evaluation of the condition should result in either true/false or a boolean value.
• The true value lies between “?” & “:” and is executed if the condition returns true. Similarly, the false value lies after “:” and is executed if the condition returns false.

Example 1: Below is an example of the Ternary Operator.

Javascript

function gfg() {
    // JavaScript to illustrate
    // Conditional operator
    let PMarks = 40
    let result = (PMarks > 39) ?
        "Pass" : "Fail";

    console.log(result);
}
gfg();

Output:

Pass

Example 2: Below is an example of the Ternary Operator.

Javascript

function gfg() {
    // JavaScript to illustrate
    // Conditional operator

    let age = 60
    let result = (age > 59) ?
        "Senior Citizen" : "Not a Senior Citizen";

    console.log(result);
}
gfg();

Output:

Senior Citizen

Example 3: Below is an example of multiple conditional operators. 

Javascript

function gfg() {
    // JavaScript to illustrate
    // multiple Conditional operators

    let marks = 95;
    let result = (marks < 40) ? "Unsatisfactory" :
        (marks < 60) ? "Average" :
            (marks < 80) ? "Good" : "Excellent";

    console.log(result);
}
gfg();

Output:

Excellent