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 supply a default worth for a variable or operate parameter. For instance, the next code snippet makes use of the double query mark operator to supply a default worth of “Unknown” for the title variable:

const title = consumer.title ?? "Unknown";

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

Read more

The double query mark operator, denoted as ??, is a logical operator in JavaScript that evaluates to its right-hand aspect operand if the left-hand aspect operand is null or undefined. In any other case, it evaluates to its left-hand aspect operand. This operator is usually 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 offers 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 know.

Read more