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.

Example: Below is an example of the Ternary Operator.

Javascript

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

    console.log(result);
    }
    gfg();
</script>

Output:

Pass

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.

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 condition results in true state.
• value if false: Value to be executed if condition results in false state.

Examples:

Input: let result = (10 > 0) ? true : false;
Output: true

Input: let message = (20 > 15) ? "Yes" : "No";
Output: Yes

The following examples will illustrate conditional operator more extensively. Example 1:

Javascript

<script>
    function gfg() {
    // JavaScript to illustrate
    // Conditional operator

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

    console.log(result);
    }
    gfg();
</script>

Output:

Senior Citizen

Example 2: An example of multiple conditional operators. 

Javascript

<script>
    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();
</script>

Output:

Excellent