JAVASCRIPT

compare two arrays and return the difference javascript

let difference = arr1
                 .filter(x => !arr2.includes(x))
                 .concat(arr2.filter(x => !arr1.includes(x)));

compare two array in javascript

let arr1 = [1, 4, 7, 4, 2, 3];
let arr2 = [1, 2, 3, 4, 7, 18];

const is_same = arr1.length == arr2.length &&
  (arr1.every((currElem)=>{
    if(arr2.indexOf(currElem)> -1){
      return (currElem == arr2[arr2.indexOf(currElem)]);
    }return false
  })
)
console.log(is_same)

compare between two arrays javascript

const equals = (a, b) => JSON.stringify(a) === JSON.stringify(b);
let arr1 = ['1','2'];
let arr2 = ['1','2'];
equals(arr1,arr2)//this return false , if not equal then its return false

javascript:compare two arrays and returns match

function select(arr, obj) {
  const result = {};
  for (let name of arr) {
    if (name in obj) {
      result[name] = obj[name];
    }
  }
  return result;
}