so I have a list var be = ["Hello", "welcome", "Hi", "morning", "Hi"] and I want to join the strings if the final string doesn't exceed 12.
so the final result must be a list: ["Hello--welcome", "Hi--morning--Hi"] // I need the -- included
I tried using regex by joining them into one big string and then using .match but didn't work.
EDIT:
this is what I tried:
var s = ["Hello", "welcome", "Hi", "morning", "Hi"].join("--")
var result = s.match(/.{1,12}/g) // ['Hello--welco', 'me--Hi--morn', 'ing--Hi']
thanks
Array#reduce, iterate over the array while updating a list of objects with words array and total (total length of words). At each iteration, check if adding the current string to the last added object would exceed a "MAX_LENGTH", if it doesn't update it, otherwise add a new objectArray#map and Array#join, return the joined list of wordsconst
arr = ["Hello", "welcome", "Hi", "morning", "Hi"],
MAX_LENGTH = 12;
const res =
arr.reduce((list, str) => {
const last = list[list.length-1];
if(last && last.total + str.length <= MAX_LENGTH) {
last.total += str.length;
last.words.push(str);
} else {
list.push({ total: str.length, words: [str] });
}
return list;
}, [])
.map(({ words }) => words.join('--'));
console.log(res);