Javascript changing function trouble

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The code below is how it was originally

   function getRandomEmail() {
        const randomNumber = Math.floor(Math.random() * 200000)+1;
        return `User${randomNumber}`

Instead of a random number generated and inserted I am trying to have an list of words added infront of the

like so

function getRandomEmail() {
var emailname = "testing testing2 testing3".split(" ");
return `User$(Math.floor(Math.random() * emailname.split)+`

The output I'm getting now while running the script is

BAD_EMAIL: that email is invalid

did I miss anything ???

1 emailname is already an array after the split in the initialization. Now what you need is it's length

2 to insert the variable use ${..}, not $()

function getRandomEmail() {
  var emailname = "testing testing2 testing3".split(" ");
  return `User${Math.floor(Math.random() * emailname.length)}`

Functions, Did you know that a JavaScript function's named parameter variables are Strangely, all of the values in the result object are set to "green" . So the arguments object isn't a “real” array, so you run into problems when you� $(".some-element").initialize( function(){ $(this).css("color", "blue"); }); The difference from .each is - it takes your selector, in this case .some-element and wait for new elements with this selector in the future, if such element will be added, it will be initialized too. In our case initialize function just change element color to blue.

Here's a simple solution that uses for readability.

function getRandomEmail(){
  return rando(["accounting", "sales", "hr"]).value + "";

<script src=""></script>

JavaScript: Don't Reassign Your Function Arguments, Functions have a set of parameters (in this case, only x ) and a body, which contains Some problems really are easier to solve with recursion than with loops. Trouble in changing function "PrintLine::queueDeltaMove() "YangXu. April 2017 in Motor Control. I try to understand the PrintLine::queueDeltaMove() function. However

I think the following is good as far my knowledge goes. Is it correct ? Did I miss anything ?

edit: doesn't function as expected. the same 'word' from the array gets used multiple times and the array is never emptied.

function getRandomEmail() {
        var emailname = "test1 test2 test3".split(" ");
        const randomElement = emailname[Math.floor(Math.random() * emailname.length)];
        const index = emailname.indexOf(randomElement);
          if (index > -1){ emailname.splice(index, 1);}
          if (emailname && emailname.length > 0) {
       console.log('emailname is not empty.');
       return `${randomElement}`;
       console.log('emailname is empty.');
        return ("no mail available");

Functions :: Eloquent JavaScript, But when a function is created using new Function , its [[Environment]] is set to reference not the current Lexical Environment, but the global one� In JavaScript, tasks involving date or time are handled using a Date object. It is a native object defined in ECMAScript, like Array or Function. which is mostly implemented in native code such as

emailname is an array of string "testing testing2 testing3". You don't need to again split.

Also, if you are using back-ticks (`) then you access variables/constant using ${variableName}, and NOT BY $(variableName)

function getRandomEmail() {
    var emailname = "testing testing2 testing3".split(" ");
    const randomElement = emailname[Math.floor(Math.random() * emailname.length)];
    return `User${randomElement}`;


The "new Function" syntax, If we ever need to change the message or the way it is shown, it's enough to modify the code in one place: the function which outputs it. JavaScript Data Types. JavaScript variables can hold numbers like 100 and text values like "John Doe". In programming, text values are called text strings. JavaScript can handle many types of data, but for now, just think of numbers and strings. Strings are written inside double or single quotes. Numbers are written without quotes.

Functions, JavaScript Exercises, Practice, Solution: JavaScript is a cross-platform, object-oriented scripting language. Inside a host environment, JavaScript can be connected to the objects of its environment to provide programmatic control over them.

The JavaScript input text value property will produce a string, containing the value of the text field. Useful Code Examples for Practice If you are only starting to learn the get input .value JavaScript, we recommend that you start by practicing with the code examples we provide in this section.

Changing HTML Content. The easiest way to modify the content of an HTML element is by using the innerHTML property.. To change the content of an HTML element, use this syntax:

  • The last row is incorrect. emailname.split. emailname was already split the row above. Probably emailname.length.
  • There's lots wrong with that (I can spot 4 completely different errors without blinking). Stop trying to put it all on one line. Store intermediate values in variables. Log them as you go. Then you'll find it a lot easier to spot your errors.
  • Have you just tried for instance to display some examples generated ? like with console.log() ? console.log(getRandomEmail())
  • So many errors in your code thats impossible to know for us what you exacly want to do.
  • Where is that BAD_EMAIL: that email is invalid coming from? There's no logging in that function. 1. getRandomEmail function is missing closing } 2. emailname.split does not evaluate to a number, yet you're trying to do multiplication. 3. You're trying to do string template? It needs to be like this I think: return `User${Math.floor(Math.random() * email.length)}`
  • That does the trick, Now I have to figure out how to remove the 'names' from the array, as .splice doesn't work with back-ticks
  • If you need to splice the array, probably you want to init it outside the function. inside the function it will just create new array any time, so the splice do nothing. so probably you need something like this: var emailname = "testing testing2 testing3".split(" "); function getRandomEmail() { const randomElement = emailname.splice(Math.floor(Math.random() * emailname.length), 1); return `User${randomElement}`; }
  • Could you please check the 'answer' I have found to my problem above?
  • @Decimo can you please elaborate on what exactly you are looking for?
  • @NotABot basically, grab a 'word' from an array and use that to create an email/name and never use that 'word' again. So an array of 1000 will go down to 0 eventually. and be able to save the used 'word'.