CODEWITHSUNDEEP
arraysangularforeach
Yuvraj
Yuvraj

Reputation: 423

Angular - array forEach index

How to identify the index for the forEach loop in the Angular4 code.

I need to splice the record inside the foreach based on the condition.

angular.forEach(myObject => {
    if(!myObject.Name)
        myObject.splice(..., 1)
};

Here I want to delete the object if the name in myObject is blank.

Upvotes: 15

Views: 135784

Answers (2)

willingdev
willingdev

Reputation: 9596

Use the second parameter of the function for loop index.

angular.forEach(myArray,function(arrayItem,index){
  console.log(arrayItem,index);
})

Upvotes: 0

HDJEMAI
HDJEMAI

Reputation: 9800

forEach is documented here:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach

Syntax:

arr.forEach(callback(currentValue[, index[, array]]) { // execute something }[, thisArg]);

Parameters:

callback: Function to execute on each element. It accepts between one and three arguments:

currentValue: The current element being processed in the array.

index: Optional, The index of currentValue in the array.

array: Optional, The array forEach() was called upon.

thisArg: Optional, Value to use as this when executing callback.

To be able to use an index inside this forEach loop, you can add an index this way:

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

@Component({
    selector: 'my-app',
    templateUrl: './app.component.html',
    styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
    name = 'Angular 6';
    myArray = [{name:"a"}, {name:""}, {name:"b"}, {name:"c"}];

    ngOnInit() {
        this.removeEmptyContent();
    }

    removeEmptyContent() {
        this.myArray.forEach((currentValue, index) => {
          if(!currentValue.name) {
              this.myArray.splice(index, 1);
          }
        });
    }
}

Working Stackblitz demo:

https://stackblitz.com/edit/hello-angular-6-g1m1dz?file=src/app/app.component.ts

Upvotes: 36

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