﻿ JavaScript array: Find the difference of two arrays - w3resource

# JavaScript: Find the difference of two arrays

## JavaScript Array: Exercise-23 with Solution

Write a JavaScript function to find the difference of two arrays.

Test Data:
console.log(difference([1, 2, 3], [100, 2, 1, 10]));
["3", "10", "100"]
console.log(difference([1, 2, 3, 4, 5], [1, [2], [3, [[4]]],[5,6]]));
["6"]
console.log(difference([1, 2, 3], [100, 2, 1, 10]));
["3", "10", "100"]

Pictorial Presentation:

Sample Solution:

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>JS, difference between two arrays</title>
<body>
</body>
</html>
```
```

JavaScript Code:

``````function differenceOf2Arrays (array1, array2) {
var temp = [];
array1 = array1.toString().split(',').map(Number);
array2 = array2.toString().split(',').map(Number);

for (var i in array1) {
if(array2.indexOf(array1[i]) === -1) temp.push(array1[i]);
}
for(i in array2) {
if(array1.indexOf(array2[i]) === -1) temp.push(array2[i]);
}
return temp.sort((a,b) => a-b);
}

console.log(differenceOf2Arrays([1, 2, 3], [100, 2, 1, 10]));
console.log(differenceOf2Arrays([1, 2, 3, 4, 5], [1, [2], [3, [[4]]],[5,6]]));
```
```

Sample Output:

```[3,10,100]
[6]
```

Flowchart:

ES6 Version:

``````function differenceOf2Arrays (array1, array2) {
const temp = [];
array1 = array1.toString().split(',').map(Number);
array2 = array2.toString().split(',').map(Number);

for (var i in array1) {
if(!array2.includes(array1[i])) temp.push(array1[i]);
}
for(i in array2) {
if(!array1.includes(array2[i])) temp.push(array2[i]);
}
return temp.sort((a,b) => a-b);
}

console.log(differenceOf2Arrays([1, 2, 3], [100, 2, 1, 10]));
console.log(differenceOf2Arrays([1, 2, 3, 4, 5], [1, [2], [3, [[4]]],[5,6]]));
``````

Live Demo:

See the Pen JavaScript - Find the difference of two arrays - array-ex- 23 by w3resource (@w3resource) on CodePen.

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﻿

## JavaScript: Tips of the Day

2d array into an object

```const keys = ["name", "age"]
const values = ["Owen", 25]

const method = /* ?? */
Object[method](keys.map((_, i) => {
return [keys[i], values[i]]
})) // { name: "Owen", age: 25 }
```