Finding certain strings in array (Javascript)

Question

I'm having a problem in searching in an array. I wanted to check if a certain string exists in one of the elements, example

Array:

["4_1", "4_2", "4_3"]

I will check if the string "4" exists in one of the variables.

Thank you!

Answer 1

You could use a loop for it.

 var arr = ["4_1", "4_2", "4_3"]; search = RegExp(4), result = arr.some(search.test.bind(search)); document.write(result); 

Answer 2

The Easiest way is to use Array.prototype.join && indexOf methods

["4_1", "4_2", "4_3"].join("").indexOf("4")

Update

According to @t.niese's comment this answer may cause wrong result, for example if you are looking for 14 it will return 2 - what is wrong because your array doesnt contain element which begins on 14 . In this case better to use @Nina's answer or you can join it in another way ["4_1", "4_2", "4_3"].join(" ").indexOf("14") // -1

Answer 3

You can actually make a loop and check the indexOf to be not -1 :

 ["4_1", "4_2", "4_3"].forEach(function (element, index, array) { if (element.indexOf(4) != -1) alert("Found in the element #" + index + ", at position " + element.indexOf(4)); });