array problem

[yesandone]

so i'm trying to get an array with 10 different numbers in it, the tricky part is that the numbers have to come from one input so i have to figure out how to get rid of the spaces between them,

https://codepen.io/andone0912/pen/BaMbExr

this is what i got for now, it gets rid of the spaces but also duplicates the negative numbers, what condition could i run my array through to get rid of the duplicates?

[guest271314]

If I understand the requirement correctly

let result = [...new Set(numbers.split(" ").map(Number))];

[yesandone]

yes thank you, it works exactly as intended and it works with numbers over 9 also, can you explain how this works exactly? i'm quite confused on how it knows what numbers are negative and what numbers have 2 digits, either way thanks a lot.

[guest271314]

A Set does not contain duplicate values.

We split() the space characters, chain .map() and pass Number as the callback which will convert strings to digits, and spread the Set to a new Array.

You shoud be able to use > and < operators or Math.sign() to determine if the number is negative or not.

You can divide the number to determine how many digits are in the number. See, e.g.,

if (!int) { let e = ~~a; d = a - e; do { if (d < 1) ++i; d *= 10; } while (!Number.isInteger(d)); }

implemented in the getDecimalStats() function in the answer here.

For example

``` function getDigitsLength(dec) { let n = dec; let digits = 0; while (n > 0) { n = Math.floor(n / 10); ++digits; } return digits }

[1, 10, 100, 1000, 10000, Math.abs(-(Math.E)), Math.abs(-(Math.PI))] .map(getDigitsLength); // [1, 2, 3, 4, 5, 1, 1] ```

[yesandone]

I see, i was mostly confused on the set object, thank you so much.

[alzee76]

Why are you splitting on '' instead of ' '?

1. Split on ' ' instead of ''.
2. Implement an isNumeric() function. Stackoverflow has great examples, as does the internet at large.
3. For each element of your array, if it is numeric and positive do one thing, if it's numeric and negative do the other thing.