What does "any[]" signify when used in a JavaScript/TypeScript array?

I am currently studying Angular2. During my lessons, I came across a requirement to save data into an "any" array. The example provided looked like this:

import { Component } from '@angular/core';

import { GithubService } from '../../services/github.service';

@Component({
  selector: 'profile',
  template: `<h1>Profile Component</h1>`,
})
export class ProfileComponent  {
  user:any[];

  constructor(private _githubService:GithubService){
    // this._githubService.getUser().subscribe(user => {console.log(user)});
    this._githubService.getUser().subscribe(user => {
       this.user = user;
    });
  }
}

What does user:any[]; mean? I tried searching for it on Google and GitHub, but couldn't find any helpful information. Not sure where to look next.

Answer №1

One important distinction to make is that any[] is a valid variable declaration in Typescript, but not in Javascript.

This declaration consists of two parts - [] is used in Typescript to indicate an array of values, while any allows for entries of any type within the array. Alternatively, you could specify a single valid type for the array, such as string[], which would create an array comprised only of string objects. The Typescript compiler would then enforce adding only string objects to this specific array.

Answer №2

variable: any; indicates that we can store any type of value in the variable, such as a string, number, object, or boolean.

list: any[]; signifies that list must be an array where the elements can have various types like strings, numbers, objects, or booleans.

Answer №3

When any is utilized, it typically suggests a lack of specificity in type declaration. As such, I highly recommend creating an interface called User to define the user object.

In addition, consider utilizing a pre-typed API for this purpose, such as https://www.npmjs.com/package/typed-github-api

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