Well, try to regex: (good site to practice is regex101.com/)
const capitalizeFirstLetters = (str) => str.replace(/(\b([a-z]))/gi, (str) => str.toUpperCase())
Now, some funny but not recommendend for this case alone:
const funnyWay = str => str.split(/\b/gi).map(char => char.replace(/^\w{1}/i, (letter) => letter.toUpperCase())).join('')
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Well, try to regex: (good site to practice is regex101.com/)
Now, some funny but not recommendend for this case alone: