Change a string from camelCase to kebab-case or snake_case and vice versa

case-convert.js

'use strict';

let DASH_LOWERCASE_REGEX = /-([a-z])/g;
let UNDERSCORE_LOWERCASE_REGEX = /_([a-z])/g;
let UPPERCASE_REGEX = /([A-Z])/g;

// func argument to .replace receives:
// 1) the matched substring
// 2) nth parenthesized substr match (i.e. if the pattern has any `()` group matches, 
// 	  those will be passed as the next args)
// 3) numeric index of the match in the whole string
// 4) full original string

// kebabToCamel('class-name-here');
// match: -n letter: n
// match: -h letter: h

function kebabToCamel(name) {
	return name.replace(DASH_LOWERCASE_REGEX, (match, letter) => letter.toUpperCase());
}

function snakeToCamel(name) {
	return name.replace(UNDERSCORE_LOWERCASE_REGEX, (match, letter) => letter.toUpperCase());
}


function camelToSnake(name) {
	return name.replace(UPPERCASE_REGEX, match => '_' + match.toLowerCase());
}

function camelToKebab(name) {
	return name.replace(UPPERCASE_REGEX, match => '-' + match.toLowerCase());
}

let out1 = snakeToCamel('table_name_here');
let out2 = camelToSnake('thisAttrName');

console.log('snakeToCamel:', out1); // -> 'tableNameHere'
console.log('camelToSnake:', out2); // -> 'this_attr_name'

Or, you know, use lodash's _.camelCase, _.kebabCase, and _.snakeCase.