计算字符串中每个单词的出现并将其放入对象中

Question

I need to get the total count of each word in a string .

I wanted to achieve it using reducer since i am a beginner in the reduce method i could not solve it .

getWordOccurence = (str1) => {
  splitStr = str1.split(' ');
  let count=0;
  const wordCount = splitStr.reduce((acc, curr) => ({...acc,[curr]:count}),{})
  console.log(wordCount)
};

getWordOccurence('apple orange apple banana grapes ?');

Expected : {"apple":2,"orange":1,"banana":1,"grape":1}

Answer 1

You can try using comma operator. I thinks its better to use comma operator to return accumulator rather than using spread operator.

 const getWordOccurence = (str1) => { splitStr = str1.split(' '); const wordCount = splitStr.reduce((ac, x) => (ac[x] = ac[x] + 1 || 1,ac),{}) console.log(wordCount) }; getWordOccurence('apple orange apple banana grapes ?'); 

One line for the function will be

 const getWordOccurence = (str) => str.split(' ').reduce((ac,a) => (ac[a] = ac[a] + 1 || 1,ac),{}) console.log(getWordOccurence('apple orange apple banana grapes ?')); 

Answer 2

You can String.prototype.split() the string and use Array.prototype.reduce() to obtain the result object

In case you need to exclude the non words you can do Regular Expression /[az]/i to check the String.prototype.match() c.match(/[az]/i)

Code:

 const str = 'apple orange apple banana grapes ?'; const getWordOccurence = s => s.split(' ').reduce((a, c) => { if (c.match(/[az]/i)) { // Only words... a[c] = (a[c] || 0) + 1; } return a; }, {}); const result = getWordOccurence(str); console.log(result); 

Answer 3

I'd like to post a pure reducer version.

 const getWordOccurence = (str1) => { const splitStr = str1.split(' '); const wordCount = splitStr.reduce((acc, x)=>({...acc,[x]:acc[x]+1||1}),{}) console.log(wordCount) }; getWordOccurence('apple orange apple banana grapes ?'); 

---

otherwise, I recommend simply use accumulator and loop through object (you can always extract it to a function, like occurence or something, you don't even need to pass the {} then).

 const getWordOccurence = (str1) => { const words = str1.split(' '); //function occurence(words){ let acc={}; for(let word of words) acc[word] = acc[word]+1 || 1 //return acc} //const wordCount = occurence(words) const wordCount = acc //just in case you want a *const* result console.log(wordCount) }; getWordOccurence('apple orange apple banana grapes ?');