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

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terascope/teraslice
81function valueExists(value: any) {
82    return value != null;
83}
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FamilySearch/gedcomx-viewer
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}
AEB-labs/cruddl
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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