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Counting adjacent pairs of words in JavaScript
Problem
We are required to write a JavaScript function that takes in a string str that represents a sentence as the only argument.
Our function should count and return the adjacent pair of identical words present in the string str. Our function should check the words ignoring their case, which means ‘it’ and ‘It’ should be counted as identical.
For example, if the input to the function is −
Input
const str = 'This this is a a sample string';
Output
const output = 2;
Output Explanation
Because the repeating words are ‘this’ and ‘a’.
Example
Following is the code −
const str = 'This this is a a sample string';
const countIdentical = (str = '') => {
const arr = str.split(' ');
let count = 0;
for(let i = 0; i < arr.length - 1; i++){
const curr = arr[i];
const next = arr[i + 1];
if(curr.toLowerCase() === next.toLowerCase()){
count++;
};
};
return count;
};
console.log(countIdentical(str));Output
2
Updated on: 22-Apr-2021
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