camelCase to kebab-case in javascript

Question

I have a kebabize function which converts camelCase to kebab-case. I am sharing my code. Can it be more optimized? I know this problem can be solved using regex. But, I want to do it without using regex.

const kebabize = str => {

    let subs = []
    let char = ''
    let j = 0

    for( let i = 0; i < str.length; i++ ) {

        char = str[i]

        if(str[i] === char.toUpperCase()) {
            subs.push(str.slice(j, i))
            j = i
        }

        if(i == str.length - 1) {
            subs.push(str.slice(j, str.length))
        }
    }

    return subs.map(el => (el.charAt(0).toLowerCase() + el.substr(1, el.length))).join('-')
}

kebabize('myNameIsStack')

Answer 1

RegEx is faster!

Unlike what you might think, the RegEx way of doing this is actually significantly faster! See benchmark.

The function below supports converting both camelCase and PascalCase into kebab-case:

function toKebabCase(str) {
    return str.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase();
}