How to convert camelcase to snake case in Javascript? [closed]

Question

I want to convert a string of that is in camel case to snake case using TypeScript.

Remember that the "snake case" refers to the format style in which each space is replaced by an underscore (_) character and the first letter of each word written in lowercase.

Example: fieldName to field_name should be a valid conversion, but FieldName to Field_Name is not valid.

Answer 1

const camelToSnakeCase = str => str.replace(/[A-Z]/g, letter => `_${letter.toLowerCase()}`);