3 examples of 'check if value already exists in array javascript' in JavaScript

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81function valueExists(value: any) {
82 return value != null;
83}
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3function addToArrayIfNotThere(value, array) {
4 var i;
5 for (i = 0; i < array.length; i++) {
6 if (array[i] === value) {
7 return i;
8 }
9 }
10 array[i] = value;
11 return i;
12}
346function isExistingAndAdd(search: string, array: string[]) {
347 if (array.indexOf(search) >= 0) {
348 array.push(search);
349 return true;
350 }
351 array.push(search);
352 return false;
353}

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