javascript array contains callback code example

Example 1: js find array return true false

['one', 'two'].some(item => item === 'one') // true
['one', 'two'].some(item => item === 'three') // false

Example 2: javascript some

const fruits = ['apple', 'banana', 'mango', 'guava'];

function checkAvailability(arr, val) {
  return arr.some(function(arrVal) {
    return val === arrVal;
  });
}

checkAvailability(fruits, 'kela');   // false
checkAvailability(fruits, 'banana'); // true