Convert string to snake case in JavaScript

function toCamelCase(str){
    return (' ' + str).toLowerCase().replace(/[^a-zA-Z0-9]+(.)/g, (m, chr) => {
        return '_' + chr}).substring(1);
}

console.log(toCamelCase('the name field id     is name-field_id'));

Snake case (stylized as snake_case) refers to the style of writing in which each space is replaced by an underscore (_ ) character, and the first letter of each word written in lowercase. It is a commonly used naming convention in computing, for example for variable and subroutine names, and for filenames.

To convert a string to a snake case in JavaScript you can use the replace method on the string and use regular expressions and callback functions to generate the right output.