js check if number is in array 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 test if it is an array
if (Array.isArray(object)) {
} else {
}
Array.isArray([1, 2, 3, 4]);
Array.isArray(4);
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: see if array contains array javascript
const found = arr1.some(r=> arr2.indexOf(r) >= 0)
Example 5: javascript check if array is in array
var array = [1, 3],
prizes = [[1, 3], [1, 4]],
includes = prizes.some(a => array.every((v, i) => v === a[i]));
console.log(includes);
Example 6: check items in array javascript
function checkAllEven(arr) {
return arr.every(function(x){
return x % 2 === 0
})
}