js add to array if not exists

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showing results for - "js add to array if not exists"
Violeta
17 Oct 2016
1if(this.items.indexOf(item) === -1) {
2    this.items.push(item);
3    console.log(this.items);
4}
5
source
Jariel
29 May 2016
1var array = ['test1','test2'];
2var item = 'test2';
3
4if(array.indexOf(item) === -1) {
5    array.push(item);
6}
7// array = ["test1", "test2"]
8
9if(array.indexOf(item) !== -1) {
10    array.push(item);
11}
12// array = ["test1", "test2", "test2"]
source
Djibril
17 Mar 2020
1var newItem = "NEW_ITEM_TO_ARRAY";
2var array = ["OLD_ITEM_1", "OLD_ITEM_2"];
3
4array.indexOf(newItem) === -1 ? array.push(newItem) : console.log("This item already exists");
5
6console.log(array)
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