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 ?

• Felix Kling: possible duplicate of array.contains(obj) in JavaScript

Answer 1

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.

Answer 2

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