JAVASCRIPT

js camel case to snake case

var s1 = 'someTextHere';
var o1 = s1.split(/(?=[A-Z])/).join('_').toLowerCase();

convert a string in snake case to camel case js, snake case to camel case js

const snakeToCamelCase = (s) =>
  s.toLowerCase().replace(/(_w)/g, (w) => w.toUpperCase().substr(1));
const str1 = 'learn_javascript';
console.log(snakeToCamelCase(str1)); // learnJavaScript

typescript convert snake case to camel case

type SnakeToCamelCase<S extends string> =
  S extends `${infer T}_${infer U}` ?
  `${T}${Capitalize<SnakeToCamelCase<U>>}` :
  S