Diff. Arrays-freecodecamp algorithm Topic

Diff two Arrays (compare two arrays)

1. Requirements

• Compares two arrays and returns a new array
• The elements of the array are two of all unique array elements in a given array. In other words, returns the difference of two arrays.

2. Ideas

• Defines a new array variable that joins the two arrays entered with. Concat () to assign to it
• Defines a check function that returns all the unique array elements in a given array of two
• Filter out the eligible elements of a new array variable with. Filter ()

3. Code

function diff(arr1, arr2) {var newArr = [];newArr = arr1.concat(arr2);function check(item){    if(arr1.indexOf(item) === -1 ||arr2.indexOf(item) === -1){    return item;    }}return newArr.filter(check);}diff([1, 2, 3, 5], [1, 2, 3, 4, 5]);

4. RELATED LINKS

• Https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

• Https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf

• Https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/concat

5. Blog notes: Future blogs are written in Mardown syntax

Diff. Arrays-freecodecamp algorithm Topic