How to use question marks in js

The question mark in JavaScript is the ternary operator, used to select one of two values ​​​​based on conditions: Syntax: result = (condition) ? value 1 : value 2; condition: if true, select value 1, Select value 2 for False.

Usage of question mark in JavaScript

The question mark (?) in JavaScript is a ternary operator. Used to select one of two values ​​via a conditional expression.

Syntax:

<code>结果 = (条件) ? 值1 : 值2;</code>

Where:

• ##The condition is a Boolean expression that determines the selection Value 1 or value 2.
• value1 is the value to be returned if condition is true.
• Value2 is the value to be returned if condition is false.

Example:

<code>const isHappy = true;
const greeting = (isHappy) ? "你好，幸福的人！" : "你好，不开心的人。";

console.log(greeting); // 输出：你好，幸福的人！</code>

Usage:

The ternary operator is often used to simplify conditional statements. It provides a concise way to select values ​​based on conditions without using

if-else statements.

Note:

The ternary operator has lower precedence than the assignment operator, so be careful when using nested operators.
• The ternary operator can only return a single value. If you need to return multiple values, use an
• if-else statement or other control flow construct.

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