Determining if there is a common element in two arrays to yield a true outcome

Question

Determining if there is a common element in two arrays to yield a true outcome

In my Ionic app built with Angular 1.x, I am dealing with two arrays containing numbers:

var arr1 = [1,32,423,43,23,64,232,5,67,54];
var arr2 = [11,32,1423,143,123,64,2232,35,467,594];

The common numbers in these arrays are 32 and 64.

I need a JavaScript solution that efficiently determines if there is at least one common number between the two arrays.

Below is the code snippet I have written:

angular.forEach(arr1 , function (arr1 , count) {
      if ( inArray(arr1 , arr2) )
      {
        return true;
      }
  });

javascript angularjs arrays algorithm ionic-framework

Answer 1

Answer №1

Utilizing ES6 makes this task simple:

var numbers1 = [1, 32, 423, 43, 23, 64, 232, 5, 67, 54];
var numbers2 = [11, 32, 1423, 143, 123, 64, 2232, 35, 467, 594];

console.log(numbers1.some(num => numbers2.includes(num)));

Answer 2

Utilizing ES6 makes this task simple:

var numbers1 = [1, 32, 423, 43, 23, 64, 232, 5, 67, 54];
var numbers2 = [11, 32, 1423, 143, 123, 64, 2232, 35, 467, 594];

console.log(numbers1.some(num => numbers2.includes(num)));

Answer 3

Answer №2

const numbers1 = [10, 24, 312, 45, 56, 67, 78, 89, 90];
const numbers2 = [15, 34, 412, 55, 66, 77, 88, 99, 100];

function findCommonNumbers(arr1, arr2) {
  let commonFound = false;
  for (let j = 0; j < arr1.length; j++) {
    if (arr2.indexOf(arr1[j]) !== -1) {
      commonFound = true;
      break;
    }
  }
  return commonFound;
}

console.log(findCommonNumbers(numbers1, numbers2));

Answer 4

const numbers1 = [10, 24, 312, 45, 56, 67, 78, 89, 90];
const numbers2 = [15, 34, 412, 55, 66, 77, 88, 99, 100];

function findCommonNumbers(arr1, arr2) {
  let commonFound = false;
  for (let j = 0; j < arr1.length; j++) {
    if (arr2.indexOf(arr1[j]) !== -1) {
      commonFound = true;
      break;
    }
  }
  return commonFound;
}

console.log(findCommonNumbers(numbers1, numbers2));

Answer 5

Answer №3

MDN some - stops searching when a match is found and returns a boolean
MDN includes - returns a boolean indicating whether an item is present in the array

var arr1 = [1,32,423,43,23,64,232,5,67,54];
var arr2 = [11,32,1423,143,123,64,2232,35,467,594];

var hasDupe = arr1.some(function(val){
   return arr2.includes(val);
});

console.log(hasDupe);

Answer 6

MDN some - stops searching when a match is found and returns a boolean
MDN includes - returns a boolean indicating whether an item is present in the array

var arr1 = [1,32,423,43,23,64,232,5,67,54];
var arr2 = [11,32,1423,143,123,64,2232,35,467,594];

var hasDupe = arr1.some(function(val){
   return arr2.includes(val);
});

console.log(hasDupe);

Determining if there is a common element in two arrays to yield a true outcome

Answer №1

Answer №2

Answer №3

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