The nullish coalescing operator (??) in Angular, as well as in JavaScript, is a syntax feature that provides a concise way to handle null or undefined values. It is used to select the first non-nullish value from a list of operands.
The nullish coalescing operator evaluates the expressions on both sides of the operator and returns the right-hand side (RHS) value if the left-hand side (LHS) value is null or undefined. If the LHS value is neither null nor undefined, it is returned instead.
Here's an example to illustrate its usage:
const result = a ?? b;
In the above code, if the value of a is null or undefined, the operator ?? returns the value of b. If a is a non-nullish value, then a itself is returned.
The nullish coalescing operator is particularly useful when you want to provide default values or fallback options in cases where a value may be null or undefined. It simplifies the code by avoiding the need for conditional statements or ternary operators to check for nullish values.
Here's an example that demonstrates how the nullish coalescing operator can be used in Angular templates:
<p>{{ user.name ?? 'Unknown' }}</p>
In the above template, if user.name is null or undefined, the nullish coalescing operator ensures that the fallback value 'Unknown' is displayed instead.
Overall, the nullish coalescing operator in Angular provides a convenient way to handle null or undefined values by selecting the first non-nullish value from a list of options, simplifying code readability and reducing the need for explicit null checks. By obtaining Angular Course, you can advance your career in Angular. With this course, you can demonstrate your expertise in applications using React concepts such as Angular Modules, Components, Databinding, Angular Forms, Angular Directives and Pipes, Services and Dependency Injection (DI), many more fundamental concepts, and many more critical concepts among others.
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