check if value already exists in array javascript code example
Example 1: check if array does not contain value javascript
var fruits = ["Banana", "Orange", "Apple", "Mango"];
var n = fruits.includes("Mango");
var n = fruits.includes("Django");
Example 2: javascript method to see if item exists in array
var fruits = ["Apple", "Banana", "Mango", "Orange", "Papaya"];
if(fruits.indexOf("Mango") !== -1){
alert("Value exists!")
} else{
alert("Value does not exists!")
}
Example 3: check value exist in array javascript
[1, 2, 3].includes(2);
[1, 2, 3].includes(4);
[1, 2, 3].includes(1, 2);
Example 4: Checking whether a value exists in an array javascript
const fruits = ['apple', 'banana', 'mango', 'guava'];
function checkAvailability(arr, val) {
return arr.some(arrVal => val === arrVal);
}
checkAvailability(fruits, 'kela');
checkAvailability(fruits, 'banana');
Example 5: check if an element is already in an array
private boolean ZitAlInArray(int value, List<Integer> list) {
return array.indexOf(value) > -1;
}
private boolean zitAlInArray(int[] array, int index) {
for (int i = 0; i < index; i++) {
if (array[i] == array[index]) {
return true;
}
}
return false;
}