What is the equivalent of angular.isString() in Angular 2?

I am currently working on a project using Angular 2 and I'm interested in finding out if there is a way to incorporate AngularJS functionalities into my Angular 2 application.

For example, in AngularJS, I used to perform the following operations:

  1. angular.isString(value)
  2. angular.isArray(value)
  3. angular.copy(value)

I would like to know if there is a module or package available that can assist me in performing these operations in Angular 2 or TypeScript?

Thank you in advance.

Answer №1

Just stick to vanilla JavaScript:

  • checkIfString

It's as easy as that

  typeof bar == 'string'
  • Array.isArray(values)

Straightforward

Array.isArray(values)
  • Make a copy of values

Simple process

Object.assign({},values)

Answer №2

Aside from the copy function, angular2 also includes functions such as isString and isArray (among others) from the

"@angular/common/src/facade/lang"
module. To utilize these functions, you must import them in the following manner:

import {isString, isArray} from "@angular/common/src/facade/lang";

However, it is worth noting that the implementation of these functions is the same as described by basarat, and this particular import method is no longer valid. Therefore, please refer to the solution provided above :)

Answer №3

For an alternative solution, consider utilizing lodash-es (which offers ES module import support for lodash) in the following manner:

import { isString } from 'lodash-es';

console.log(isString('') === true);

In my opinion, this approach surpasses using typeof foo === 'string' as string literals are error-prone and not as easy to minify.

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