Twice join of two strings in JavaScript

We are required to write a JavaScript function that takes in two strings; creates and returns a new string with first 2 words of first string, next two words of second string, then first, then second and so on.

For example: If the strings are −

const str1 = 'Hello world'; const str2 = 'How are you btw';

Then the output should be −

const output = 'HeHollw o arwoe rlyodu btw';

Therefore, let’s write the code for this function −

Example

The code for this will be −

const str1 = 'Hello world'; const str2 = 'How are you btw'; const twiceJoin = (str1 = '', str2 = '') => {    let res = '', i = 0, j = 0, temp = '';    for(let ind = 0; i < str1.length; ind++){       if(ind % 2 === 0){          temp = (str1[i] || '') + (str1[i+1] || '')          res += temp;          i += 2;       }else{          temp = (str2[j] || '') + (str2[j+1] || '')          res += temp;          j += 2;       }    };    while(j < str2.length){       res += str2[j++];    };    return res; }; console.log(twiceJoin(str1, str2));

Output

The output in the console will be −

HeHollw o arwoe rlyodu btw