How to check an array for a value? javascript [duplicate]

simple like this

if (array1[0] == "0") { //Do something } 

and if you have more values in your array you should use indexOf()

var array1 = [0, 3, 1, 4]; if (array1.indexOf(0) != -1) { //Do something } 

DONT KNOW WHAT TO SAY TO CHECK FOR 0 IN THE ARRAY

If you want to check for 0 in the array1 (anywhere in the array), then use indexOf

if (array1.indexOf(0) != -1) { Do something } 

if(array1.indexOf(0) == 0){ //Do your code } 

Also you can do

for(var i in array){ if(array[i] == 0){ //Do all the things } } 

You need to access the array. If you have no idea what place the array is you need to go through the array.

for (var i = 0; i < array.length; i++) { if (array[i] == 0) { //Do all the things } }