Angular : how to stop duplicate item push in array?

Question

Here data console and this data push in duplicatePushArray but it once pushed I dont want to push again but if I push again i want to show same message second time also.

Ex. first time I push 2.jpg,3.jpg now again I push 2.jpg,3.jpg so it shows message like this 2.jpg,3.jpg value is already pushed please change this values now again I push 2.jpg,3.jpg so it shows message like this 2.jpg,3.jpg,2.jpg,3.jpg value is already pushed please change this values but i want to show message like this 2.jpg,3.jpg value is already pushed please change this values

console.log(data); // (2) [{…}, {…}]0: {imageName: "2.jpg"}1: {imageName: "3.jpg"}
duplicatePushArray : any[] = [];
constructor(private snackBar : MatSnackBar) {}      

for(var i = 0; i < data.length ; i++){
  if(this.duplicatePushArray.indexOf(data[i].imageName)) {
    this.duplicatePushArray.push(data[i].imageName);
    this.snackBar.open(this.duplicatePushArray+' '+ 'value is already pushed please change this values', '',{
      duration: 2000
    })
  }
}

use if(this.duplicatePushArray.indexOf(data[i].imageName) === -1) { — Tamil Selvan C
– Tamil Selvan C, Commented Dec 3, 2018 at 4:55
@TamilSelvanC yes it not allow to push second time but i want to show message always when try to push again — Dharmesh
– Dharmesh, Commented Dec 3, 2018 at 4:59
I think you can use includes instead of indexOf or change the condition checking as @TamilSelvanC suggested — Code Maniac
– Code Maniac, Commented Dec 3, 2018 at 5:00

sridhar · Accepted Answer · 2018-12-03 05:07:04Z

3

const data = [1,2,3,4,5,6,7,1,2,3,4,1,2];
let duplicatePushArray = [];
for(let i = 0; i < data.length ; i++){
  if(duplicatePushArray.indexOf(data[i]) === -1) {
    duplicatePushArray.push(data[i]);
  } else {
    console.log(`${data[i]} is already pushed into array`);
  }
}

console.log('Final Array: ', duplicatePushArray)

answered Dec 3, 2018 at 5:07

sridhar

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