JS function to format a camelCase string into a "Camel Case" pretty string

prettyCamelCase.js

function prettyFormat(str) {
  return str.split(/(?=[A-Z])/)
            .map(function(word) {
              return word.charAt(0).toUpperCase() + word.slice(1);
            })
            .join(' ');
}

Usage

let camelCaseStr = "thisIsAStringInCamelCase";
let prettyStr = prettyFormat(camelCaseStr);
console.log(prettyStr); // "This Is A String In Camel Case"