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Keeping only redundant words in a string in JavaScript
We are required to write a JavaScript function that takes in a string and returns a new string with only the words that appeared for more than once in the original string.
For example:
If the input string is −
const str = 'this is a is this string that contains that some repeating words';
Output
Then the output should be −
const output = 'this is that';
Let’s write the code for this function −
Example
The code for this will be −
const str = 'this is a is this string that contains that some repeating
words';
const keepDuplicateWords = str => {
const strArr = str.split(" ");
const res = [];
for(let i = 0; i < strArr.length; i++){
if(strArr.indexOf(strArr[i]) !== strArr.lastIndexOf(strArr[i])){
if(!res.includes(strArr[i])){
res.push(strArr[i]);
};
};
};
return res.join(" ");
};
console.log(keepDuplicateWords(str));Output
The output in the console −
this is that
Updated on: 17-Oct-2020
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