TypeScript simplest way to check if item exists in array like C# Linq Any ( using any library )

Use .some:

myArray.some(x=>x==3);

FIDDLE: https://jsfiddle.net/vktawbzg/

NPM: https://www.npmjs.com/package/linqscript

GITHUB: https://github.com/sevensc/linqscript

Take a look at my Github Repository. It would be great if you guys can help to improve it! https://github.com/sevensc/linqscript

Syntax:

list.Any(c => c.Name === ("Apple"))

You can use the findindex method :

if( myArray.findIndex(x => x === 3) >= 0) {
    // foud myArray element equals to 3
}

If this is the only thing you need to do you should go for .some (with polyfill) if you however want Linq functionality for other things as well you should take a look at https://github.com/ReactiveX/IxJS.

There is a TypeScript library for LINQ.

It is called ts-generic-collections-linq.

Providing strongly-typed, queryable collections such as:

• List
• Dictionary

Easy to use.

NPM

https://www.npmjs.com/package/ts-generic-collections-linq

Sample linq query:

let myArray=[1,2,3,4];

let list = new List(myArray);

let is_3_Exist = list.any(x => x==3);

For those who want to fiddle more with prototype to get started writing such 'extension methods':

   if (!Array.prototype.Any) {
  Array.prototype.Any = function <T>(condition: predicate<T>): boolean {
    if (this.length === 0)
      return false;
    let result: boolean = false;
    for (let index = 0; index < this.length; index++) {
      const element = this[index];
      if (condition(element)) {
        result = true;
        break;
      }
    }
    return result;
  }
}

The prototype allows you to add functionality to arrays like and call the functionality easy:

let anyEven = [5, 3, 1, 7, 3, 4, 7].Any(x => x % 2== 0); //true