How to search for a value in an Array of JavaScript?

 

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  • Best way to find if an item is in a JavaScript array? [duplicate] 8 answers
  • Check if object is array? 38 answers

    • You can use the indexOf() function you simply do this : array.indexOf("string") It will return -1 if the item is not found, otherwise just the position. Here's a link W3Schools.

    I think that has been asked thousands of times: 

    if(myFancyArray.indexOf(document.formName.elementName.value) !== -1){
   alert("You did something wrong!");
}

    Watch out as old versions of IE don't know indexOf . (but who needs IE?)

    Use indexOf 

    function search(arr,obj) {
    return (arr.indexOf(obj) != -1);
}

    Test cases: 

    search(["a","b"], "a"); // true
search(["a","b"], "c"); //false
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