js math random string code example

Example 1: 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);

Example 2: how to generate random character from an array js

function makeid() {
  var text = "";
  var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

  for (var i = 0; i < 5; i++)
    text += possible.charAt(Math.floor(Math.random() * possible.length));

  return text;
}

console.log(makeid());