How the Question Mark (?) Operator Works in JavaScript

How the Question Mark (?) Operator Works in JavaScript

Three Main Uses for the Question Mark (?) in JavaScript: Ternary Operator, Optional Chaining, Nullish Coalescing. The conditional or question mark operator, represented by a ?, is one of the most powerful features in JavaScript. The ? operator is used in conditional statements, and when paired with a :, can function as a compact alternative to if...else statements.

The conditional or question mark operator, represented by a ?, is one of the most powerful features in JavaScript. The ? operator is used in conditional statements, and when paired with a :, can function as a compact alternative to if...else statements.

But there is more to it than meets the eye. There are three main uses for the ? operator, two of which you might not used or even heard of. Let's learn about them all in detail.

Three Main Uses for the Question Mark (?) in JavaScript:

  1. Ternary Operator
  2. Optional Chaining
  3. Nullish Coalescing

We'll look at each of these in detail, starting with the most common way you'll see the ? operator being used – as a ternary operator.

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