js random string

                                    function randomString(length) {
		var result           = '';
		var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789~!@#$%^&*()_+=-';
		var charactersLength = characters.length;
		for ( var i = 0; i < length; i++ ) {
		   result += characters.charAt(Math.floor(Math.random() * charactersLength));
		}
		return result;
	 }
randomString(4);

                                    const string_length = 10
[...Array(string_length)].map(i=>(~~(Math.random()*36)).toString(36)).join('')

                                    // program to generate random strings

const result = Math.random().toString(36).substring(2,7);
console.log(result);

                                    function getRandomString(length) {<br/>    var randomChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';<br/>    var result = '';<br/>    for ( var i = 0; i &lt; length; i++ ) {<br/>        result += randomChars.charAt(Math.floor(Math.random() * randomChars.length));<br/>    }<br/>    return result;<br/>}<br/><br/>//usage: getRandomString(20); // pass desired length of random string

                                    function makeid(length) {
    var result           = [];
    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
      result.push(characters.charAt(Math.floor(Math.random() * 
 charactersLength)));
   }
   return result.join('');
}

console.log(makeid(5));