javascript

Discover the Secrets of the JavaScript Double Question Mark

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Discover the Secrets of the JavaScript Double Question Mark

The double question mark operator, denoted as ??, is a logical operator in JavaScript that evaluates to its right-hand side operand if the left-hand side operand is null or undefined. Otherwise, it evaluates to its left-hand side operand. This operator is commonly used for assigning a default value to a variable when the variable may be null or undefined.

One of the key benefits of using the double question mark operator is that it provides a concise and readable way to handle null and undefined values. It eliminates the need for lengthy if-else statements or ternary operators, making the code more succinct and easier to understand.

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Unveiling the JavaScript Question Mark Operator: Discoveries and Insights Await

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Unveiling the JavaScript Question Mark Operator: Discoveries and Insights Await

The JavaScript question mark operator, also known as the ternary conditional operator, is a concise and versatile tool used to evaluate expressions and conditionally assign values based on their truthiness. It takes the following syntax: condition ? true_value : false_value where condition is any expression that evaluates to a boolean value (true or false), true_value is the value to be assigned if the condition is true, and false_value is the value to be assigned if the condition is false.

The question mark operator is particularly useful for simplifying conditional statements and making code more readable and maintainable. For instance, consider the following traditional if-else statement: if (user.age >= 18) {status = 'adult';} else {status = 'minor';}Using the question mark operator, we can rewrite this statement more concisely as: const status = user.age >= 18 ? 'adult' : 'minor';This compact syntax improves code readability and reduces the potential for errors.

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Unveil the Power of JavaScript's Double Question Mark: A Guide to Clarity and Conciseness

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Unveil the Power of JavaScript's Double Question Mark: A Guide to Clarity and Conciseness

In JavaScript, the double question mark operator (??) is a logical operator that evaluates to the value of its right-hand operand if its left-hand operand is null or undefined, and otherwise evaluates to the value of its left-hand operand.

The double question mark operator is often used to provide a default value for a variable or function parameter. For example, the following code snippet uses the double question mark operator to provide a default value of “Unknown” for the name variable: 

const name = user.name ?? "Unknown";

The double question mark operator can also be used to chain multiple default values. For example, the following code snippet uses the double question mark operator to provide a default value of “Unknown” for the name variable, and a default value of “example@email.com” for the email variable:

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