JavaScript Compare Two Arrays for Matches

JavaScript compare two arrays for matches; Through this tutorial, i am going to show you how to compare two arrays to find matches in JavaScript arrays.

Let, you have the following arrays in javaScript:

let arr1=  [1,10,11,12,15,100,5,6,7,5];
let arr2=  [1,10,11,12,15,100,50,60,70,50]; 

And want to find matching values in two arrays javascript; So, you can see the simple two ways to find matching values in two arrays javascript.

JavaScript Compare Two Arrays for Matches

Here, i will provide you two simple ways to find matching values in two arrays javascript; as shown below:

  • Solution 1 – find matching values in two arrays javascript
  • Solution 2 – find matching values in two arrays javascript

Solution 1 – find matching values in two arrays javascript

let arr1=  [1,10,11,12,15,100,5,6,7,5];
let arr2=  [1,10,11,12,15,100,50,60,70,50];
 function arrayMatch(arr1, arr2) {
    var arr = [];
    arr1 = arr1.toString().split(',').map(Number);
    arr2 = arr2.toString().split(',').map(Number);
    console.log(arr1);
    // for array1
    for (var i in arr1) {
       if(arr2.indexOf(arr1[i]) !== -1)
       arr.push(arr1[i]);
    }
    console.log(arr);
    return arr.sort((x,y) => x-y);
 }
console.log(arrayMatch(arr1, arr2)); // [1, 10, 11, 12, 15, 100]

Here,

  • First of declaring two arrays with elements.
  • Declare a function, which is used to compare two arrays and find matches.
    • first of all, Declare an empty array name arr.
    • next split array by commas using split() method.
    • iterate for-in loop over the array elements.
    • Each iteration, matches first array elements to second array elements using indexOf() method, if they match then push elements into arr array.
    • Sort arr array elements in ascending order and as well as return sorted array list.
  • Call above defined function with arguments(arr1 and arr2).
  • Print result using Console.log().

Solution 2 – find matching values in two arrays javascript

let arr1=  [1,10,11,12,15,100,5,6,7,5];
let arr2=  [1,10,11,12,15,100,50,60,70,50];
function arrayMatch(arr1, arr2) {
  var arr = [];  // Array to contain match elements
  for(var i=0 ; i<arr1.length ; ++i) {
    for(var j=0 ; j<arr2.length ; ++j) {
      if(arr1[i] == arr2[j]) {    // If element is in both the arrays
        arr.push(arr1[i]);        // Push to arr array
      }
    }
  }
  
  return arr;  // Return the arr elements
}
console.log(arrayMatch(arr1, arr2)); // [1, 10, 11, 12, 15, 100]

Here,

  • First of declaring two arrays with elements.
  • Declare a function, which is used to compare two arrays and find common elements.
    • first of all, Declare an empty array name arr.
    • iterate through all the elements in one of the arrays.
    • Then, for each element in this array, iterate through all the elements of the other array.
    • If the element is present in both array, then push this element to the arr array.
    • Otherwise, continue with the next element.
  • Call above defined function with arguments(arr1 and arr2).
  • Print result using Console.log().

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