Why is it necessary to include a dollar sign before interpolation in Angular?

Question

Why is it necessary to include a dollar sign before interpolation in Angular?

While diving into a tutorial, I stumbled upon a piece of code that piqued my curiosity. I grasped the concept that appending a dollar sign as a suffix indicates observability, but I wonder why the dollar sign was also prefixed to

this.log(`updated hero id=${hero.id}`)

.

/** PUT: update the hero on the server */
updateHero(hero: Hero): Observable<any> {
  return this.http.put(this.heroesUrl, hero, this.httpOptions).pipe(
    tap(_ => this.log(`updated hero id=${hero.id}`)),
    catchError(this.handleError<any>('updateHero'))
  );
}

angular typescript angular8

Answer 1

Answer №1

Template literals or template strings are a feature of JavaScript that is not specific to angular. For more information, you can visit this link.

With template strings, you can include variables directly in the string using backticks (`) instead of traditional quotes ('' or ""). Here's an example:

const greeting = 'Hello';
const message = `${greeting} world`; 
//Output: Hello World
console.log(message);

If you were to use the traditional approach, you would need to use concatenation like this: message = greeting + ' World';

Answer 2

Template literals or template strings are a feature of JavaScript that is not specific to angular. For more information, you can visit this link.

With template strings, you can include variables directly in the string using backticks (`) instead of traditional quotes ('' or ""). Here's an example:

const greeting = 'Hello';
const message = `${greeting} world`; 
//Output: Hello World
console.log(message);

If you were to use the traditional approach, you would need to use concatenation like this: message = greeting + ' World';

Answer 3

Answer №2

JavaScript has a feature called string interpolation that lets you insert expressions into strings.

const myVar = 'World!';

const string1 = 'Hello, ' + myVar;
const string2 = `Hello, ${myVar}`;

console.log(string1, string2);

Using the dollar sign for observable properties is more of a convention rather than a strict syntax rule.

Answer 4

JavaScript has a feature called string interpolation that lets you insert expressions into strings.

const myVar = 'World!';

const string1 = 'Hello, ' + myVar;
const string2 = `Hello, ${myVar}`;

console.log(string1, string2);

Using the dollar sign for observable properties is more of a convention rather than a strict syntax rule.

Why is it necessary to include a dollar sign before interpolation in Angular?

Answer №1

Answer №2

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