double

In JavaScript, the double query mark operator (??) is a logical operator that evaluates to the worth of its right-hand operand if its left-hand operand is null or undefined, and in any other case evaluates to the worth of its left-hand operand.

The double query mark operator is usually used to offer a default worth for a variable or perform parameter. For instance, the next code snippet makes use of the double query mark operator to offer a default worth of “Unknown” for the identify variable:

const identify = person.identify ?? "Unknown";

The double query mark operator can be used to chain a number of default values. For instance, the next code snippet makes use of the double query mark operator to offer a default worth of “Unknown” for the identify variable, and a default worth of “instance@e-mail.com” for the e-mail variable:

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The double query mark operator, denoted as ??, is a logical operator in JavaScript that evaluates to its right-hand facet operand if the left-hand facet operand is null or undefined. In any other case, it evaluates to its left-hand facet operand. This operator is often used for assigning a default worth to a variable when the variable could also be null or undefined.

One of many key advantages of utilizing the double query mark operator is that it gives a concise and readable technique to deal with null and undefined values. It eliminates the necessity for prolonged if-else statements or ternary operators, making the code extra succinct and simpler to grasp.

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