im struggling with following logic.
I am creating following array of objects upon running through a given string.
[{"word":"Frank","c":1},
{"word":"Irina","c":1},
{"word":"Frank","c":1},
{"word":"Frank","c":1},
{"word":"Thomas","c":1}]
what i want to achieve is:
[{"word":"Frank","c":3},
{"word":"Irina","c":1},
{"word":"Thomas","c":1}]
what would be the best way here?
I am sending the string to this function and create the array. but im not able to get what I want.
function words(str) {
return str.split(" ").reduce(function(count, word) {
if(word.length>2&&isLetter(word)){
data.push({word:word, count: 1});
}
}, {});
}
thanks for some help Adrian
You can use object accumulator to keep count of each word and then using Object.values() get all the values.
function words(str) {
return Object.values(str.split(" ").reduce((result, word) => {
result[word] ??= {word, count: 0};
result[word].count += 1;
return result;
}, {}));
}
console.log(words("Frank Irina Frank Frank Thomas"));.as-console-wrapper { max-height: 100% !important; top: 0; }Assuming that c is not always 1 (in which case you can do as the other post suggested and just keep count of the words), you can do it like this, looping through the data and summing the c values in a buffer, using word as the key for the buffer. Then map the buffer values to a final array.
const data = [{"word":"Frank","c":1},
{"word":"Irina","c":1},
{"word":"Frank","c":1},
{"word":"Frank","c":1},
{"word":"Thomas","c":1}];
//console.log(data);
let buffer = {};
data.forEach(i=>{
let w = i.word;
let words = buffer[w] || {word: w, c: 0};
words.c = i.c*1 + words.c;
buffer[w] = words;
});
let final = Object.values(buffer).map(b=>{
return {word: b.word, c: b.c};
});
console.log(final);This will work for any values of c:
const data = [{"word":"Frank","c":2},
{"word":"Irina","c":4},
{"word":"Frank","c":1},
{"word":"Frank","c":3},
{"word":"Thomas","c":1}];
//console.log(data);
let buffer = {};
data.forEach(i=>{
let w = i.word;
let words = buffer[w] || {word: w, c: 0};
words.c = i.c*1 + words.c;
buffer[w] = words;
});
let final = Object.values(buffer).map(b=>{
return {word: b.word, c: b.c};
});
console.log(final);