Intl.Segmenter

const segmenterFr = new Intl.Segmenter("fr", { granularity: "word" });
const string = "Que ma joie demeure";

const iterator = segmenterFr.segment(string)[Symbol.iterator]();

console.log(iterator.next().value.segment);
// : 'Que'

console.log(iterator.next().value.segment);
// : ' '

const str = "";
console.table(str.split(" "));
// ['']
//  2 

const str = "";
const segmenterJa = new Intl.Segmenter("ja-JP", { granularity: "word" });

const segments = segmenterJa.segment(str);
console.table(Array.from(segments));
// [{segment: '', index: 0, input: '', isWordLike: true},
// etc.
// ]