execute Function from string

script.js

function executeFunction(string, context /*,  args*/){
    /*
    * https://stackoverflow.com/questions/7650071/is-there-a-way-to-create-a-function-from-a-string-with-javascript
    * https://stackoverflow.com/questions/359788/how-to-execute-a-javascript-function-when-i-have-its-name-as-a-string
    * */
    var args = Array.prototype.slice.call(arguments, 2);
    if(!context){
        context = window;
    }
    if(typeof string == "string"){

        let trim = function (str, charlist) {
            //  discuss at: https://locutus.io/php/trim/
            // original by: Kevin van Zonneveld (https://kvz.io)
            // improved by: mdsjack (https://www.mdsjack.bo.it)
            // improved by: Alexander Ermolaev (https://snippets.dzone.com/user/AlexanderErmolaev)
            // improved by: Kevin van Zonneveld (https://kvz.io)
            // improved by: Steven Levithan (https://blog.stevenlevithan.com)
            // improved by: Jack
            //    input by: Erkekjetter
            //    input by: DxGx
            // bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
            //   example 1: trim('    Kevin van Zonneveld    ')
            //   returns 1: 'Kevin van Zonneveld'
            //   example 2: trim('Hello World', 'Hdle')
            //   returns 2: 'o Wor'
            //   example 3: trim(16, 1)
            //   returns 3: '6'

            let whitespace = [
                ' ',
                '\n',
                '\r',
                '\t',
                '\f',
                '\x0b',
                '\xa0',
                '\u2000',
                '\u2001',
                '\u2002',
                '\u2003',
                '\u2004',
                '\u2005',
                '\u2006',
                '\u2007',
                '\u2008',
                '\u2009',
                '\u200a',
                '\u200b',
                '\u2028',
                '\u2029',
                '\u3000',
            ].join('')
            let l = 0
            let i = 0
            str += ''

            if (charlist) {
                whitespace = (charlist + '').replace(/([[\]().?/*{}+$^:])/g, '$1')
            }

            l = str.length
            for (i = 0; i < l; i++) {
                if (whitespace.indexOf(str.charAt(i)) === -1) {
                    str = str.substring(i)
                    break
                }
            }

            l = str.length
            for (i = l - 1; i >= 0; i--) {
                if (whitespace.indexOf(str.charAt(i)) === -1) {
                    str = str.substring(0, i + 1)
                    break
                }
            }

            return whitespace.indexOf(str.charAt(0)) === -1 ? str : ''
        }

        let execute_function_by_name = function(functionName, context,  args ){
            var namespaces = functionName.split(".");
            var func = namespaces.pop();
            for(var i = 0; i < namespaces.length; i++) {
                context = context[namespaces[i]];
            }
            if(!!context[func]){
                return context[func].apply(context, args);
            }
            return null;
        };

        let is_anon_function = function (string) {
            var funcReg = /function *\(([^()]*)\)[ \n\t]*{(.*)}/gmi;
            var match = funcReg.exec(string.replace(/\n/g, ' '));

            if(match) {
                let args = match[1].split(',')
                return {
                    'function':new Function(args, match[2]),
                    'args':args,
                }
            }

            return null;
        };

        let is_function_name_with_param = function (string) {
            var funcReg = /([^(]*) *\(([^()]*)\)/gmi;
            var match = funcReg.exec(string.replace(/\n/g, ' '));
            if(match) {
                let args = match[2].split(',');
                args.forEach((element, index) => {
                    element = trim(element,'"');
                    element = trim(element,"'");
                    args[index] = element;
                });
                return {
                    'function_name':match[1],
                    'args':args,
                }
            }

            return null;
        };

        let res = is_anon_function(string);
        if(!!res && res['function']){
            return res['function'].apply(context,res['args']);
        }else{
            res = is_function_name_with_param(string);
            if(!!res && res['function_name']){
                execute_function_by_name(res['function_name'], context, res['args']);
            }else{
                execute_function_by_name(string, context, args);
            }
        }
    }
}