checking whether a value exists in an array javascript

1 var fruits = ["Apple", "Banana", "Mango", "Orange", "Papaya"];
2    
3    // Check if a value exists in the fruits array
4    if(fruits.indexOf("Mango") !== -1){
5        alert("Value exists!")
6    } else{
7        alert("Value does not exists!")
8    }

1const fruits = ['apple', 'banana', 'mango', 'guava'];
2
3function checkAvailability(arr, val) {
4  return arr.some(arrVal => val === arrVal);
5}
6
7checkAvailability(fruits, 'kela');   // false
8checkAvailability(fruits, 'banana'); // true

1private boolean ZitAlInArray(int value, List<Integer> list) {
2  return array.indexOf(value) > -1;
3}
4
5private boolean zitAlInArray(int[] array, int index) {
6		for (int i = 0; i < index; i++) {
7			if (array[i] == array[index]) {
8				return true;
9			}
10		} 
11		return false;
12	}
13