Could someone please help me with this javascript exercise?

skylarnighter · Nov 9, 2021

I have just started teaching myself and I'm stuck on this exercise.
'Write a program that asks the user for a number n and prints the sum of the numbers 1 to n'

I will attach my code so you can see where I'm wrong.

Thanks in advance, guys!

ps: 'eingabe' is the german word for input

BigDady · Nov 9, 2021

Pictures are not a help when it comes to code. Use the < / > and paste your code. Line 16 should be removed.
Defining result should be done before (outside) the for loop. -> With it inside you keep making it zero for every iteration.
Plus 'result = '';' always defines a string in JS. so use
result = Number(result + i);

I don't think the $ dollar signs are needed.

skylarnighter · Nov 10, 2021

JavaScript:

<html>
    <body>
        <script>
            "use strict"
            let eingabe = Number(prompt('Give me a positive integer:'));

            function findSum(eingabe) {
             let result = 0;
             result = Number(result + i);
             for(let i = 1; i <= eingabe; i++)
            
             return result
            }

        console.log(`Sum of numbers from 1 to {eingabe} is {findSum(eingabe)}`)
        </script>
    </body>
</html>

I have tried to adjust the code but it still seems to not work.
When running the code in my browser I get the pop-up field but nothing after that.

BigDady · Nov 11, 2021

I like making my variables global unless there is a good reason not to.
You didn't write anything inside the loop.
Why are you using curly brackets? They are not needed.
You are not using single quotes in the last statement. You're using an acute or backtick. The single quote is on the same key as the double quote.
You are enclosing the variables in the quote. See how I do it.
I use alerts (Old school). Don't like opening the console to see one thing.

Always end a statement with a semicolon.

Code:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<meta content="width=device-width, initial-scale=1" name="viewport">
</head>

<body>
<script>
var eingabe = Number(prompt('Give me a positive integer:'));
var result = 0;
function findSum(eingabe){
    for(i=1; i<=eingabe; i++){
        result = Number(result + i);
    }
    return result;
}
alert('Sum of numbers from 1 to ' + eingabe + ' is ' + findSum(eingabe));
</script>
</body>
</html>

skylarnighter · Nov 13, 2021

Thank you, I think I got it now.
Except what the meta charset is responsible for.

BigDady · Nov 13, 2021

It defines the character set used to write the website. We should also declare the language.

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Could someone please help me with this javascript exercise?

skylarnighter

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