Check if string inside an array javascript

Question

If i had an array of days names and i wanted to check for example if sunday - first letter capital or small - in this array what would be the best thing to do ?

possible duplicate of array.contains(obj) in JavaScript

Felix Kling
– Felix Kling

2013-01-22 15:04:37 +00:00
Commented Jan 22, 2013 at 15:04 — Felix Kling
– Felix Kling, Commented Jan 22, 2013 at 15:04

VisioN · Accepted Answer · 2013-01-22 15:04:32Z

22

You may also use Array.indexOf:

var days = ["monday",
            "tuesday",
            "wednesday",
            "thursday",
            "friday",
            "saturday",
            "sunday"];

function isInArray(days, day) {
    return days.indexOf(day.toLowerCase()) > -1;
}

isInArray(days, "Sunday");  // true
isInArray(days, "sunday");  // true
isInArray(days, "sUnDaY");  // true
isInArray(days, "Anyday");  // false

Check the browser compatibility in MDN.

answered Jan 22, 2013 at 15:04

VisioN

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JohnJohnGa · Accepted Answer · 2013-01-22 14:58:35Z

4

function is_in_array(s,your_array) {
    for (var i = 0; i < your_array.length; i++) {
        if (your_array[i].toLowerCase() === s.toLowerCase()) return true;
    }
    return false;
}

Usage:

var arr = ["hello","ToTo"];
is_in_array("toto",arr) //true
is_in_array("todto",arr) //false

answered Jan 22, 2013 at 14:58

JohnJohnGa

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