Find occurance of characters in array of object using js-CodePudding

I have array of object with few words I want to know occurance of each word and push into key value pair format

let words = ["aabbbc", "dddeeef", "gghhhii"]

Output
[{a:2, b:3,c:1}, {d:3,e:3,f:1}, {g:2,h:3:i:2}]

CodePudding user response：

let words = ["aabbbc", "dddeeef", "gghhhii"]

const occurences = (w) => {
    const obj = {};
  for (const c of w) {
    if (obj[c] === undefined) obj[c] = 0;
    obj[c]  ;
  }
  return obj;
}

const arr = words.map(w => occurences(w));
console.log(arr)

CodePudding user response：

This is a classic map and reduce task where one maps the array of strings and for each string creates the character-specific counter-statistics while reducing the string's character-sequence (...split('').reduce( ... )) and by programmatically building an object which counts/totals each character's occurrence.

console.log(
  ["aabbbc", "dddeeef", "gghhhii"]
    .map(string =>
      string
        .split('')
        .reduce((result, char) => {
          result[char] = (result[char] ?? 0)   1;
          return result;
        }, {})
    )
)
// [{a:2, b:3,c:1}, {d:3,e:3,f:1}, {g:2,h:3:i:2}]

.as-console-wrapper { min-height: 100%!important; top: 0; }

CodePudding user response：

let words = ["aabbbc", "ddeeef", "ghhhii"]
let newArr = []

words.forEach((e,index)=>{
    e.split('').forEach(n=>{
        if(!newArr[index]){
            newArr[index]={}
        }
        if(!newArr[index][n]){
            newArr[index][n]=0
        }
        (newArr[index][n]>=0) &&   newArr[index][n]
    })
})

CodePudding user response：

Trying to keep it easy and readable:

const words = ['aabbbc', 'dddeeef', 'gghhhii']
const output = []

for (const word of words) {
  const result = {}
  for (const letter of word) {
    result[letter] = result[letter] || 0
    result[letter]  
  }
  output.push(result)
}

console.log({ output })