How Does the Ternary Operator Work in JavaScript?

Understanding the Ternary Operator in JavaScript

In the given line of code:

hsb.s = max != 0 ? 255 * delta / max : 0;

you may encounter the question marks (?) and colons (:) and wonder their purpose. These characters represent the ternary operator, a shorthand syntax for conditional statements in JavaScript.

Syntax

The ternary operator takes the form:

condition ? value-if-true : value-if-false

Where:

• condition is a comparison or boolean expression that evaluates to true or false.
• value-if-true is the value returned if the condition evaluates to true.
• value-if-false is the value returned if the condition evaluates to false.

Interpretation

In simpler terms, you can read the ternary operator as "If the condition is true, do this, otherwise do that." The question mark (?) represents "if" and the colon (:) represents "otherwise."

Example

The provided code essentially means:

if (max != 0) {
  hsb.s = 255 * delta / max;
} else {
  hsb.s = 0;
}

It assigns the value 255 * delta / max to hsb.s if max is not zero; otherwise, it assigns zero to hsb.s.

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