Split string into array of n length

Question

So I have a string that I need to split into an array, for example:

"1234567890"

I need to be able to split it like:

"1234567890".break(2) = ["12345", "67890"]

and:

"1234567890".break(3) = ["123", "456","7890"]

So I don't want it to split it into an array of equal parts, I want to split the string into an array of length n. How do you think I would go about doing this?

No, its not this: regex - Split large string in n-size chunks in JavaScript

I want the array's total length to be N(Pressed enter accidently :/) — Kitsumi, Jan 09 '16 at 10:47
@Alexander, Nina Scholz, The problem looks a bit different than the older one. (I apologize for my flag initially, I didn't find an option to undo my flag.) — Tᴀʀᴇǫ Mᴀʜᴍᴏᴏᴅ, Jan 09 '16 at 10:58
What should happen when you can't split string to strings with equal lengths (e.g. you want to break string `"abcdefghijklmn"` into 5 strings)? — Michał Perłakowski, Jan 09 '16 at 13:08

Alexander Elgin · Accepted Answer · 2016-01-09T12:35:47.437

2

That's exactly what you asked

function breakString(str, items) {
  var result = str.match(new RegExp('.{1,' + Math.floor(str.length / items) + '}', 'g'));

  while(result.length > items) {
    result[result.length - 2] += result[result.length - 1];
    result.splice(result.length - 1, 1);
  }

  return result;
}

edited Jan 09 '16 at 12:35

answered Jan 09 '16 at 12:28

Alexander Elgin

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The code breaks when (1) **zero** is passed as items parameter, (2) **array** or **object** is passed as str parameter. – Arman Ozak Jan 09 '16 at 13:05
1

@ArmanOzak Why do you expect it to work when you pass wrong parameters? – Michał Perłakowski Jan 09 '16 at 13:06
Thanks so much! This does break when the number you pass is less than the string length. – Kitsumi Jan 09 '16 at 13:16
@Gothdo, I think a function with parameters should rather test the arguments first. Otherwise, there is a risk of ruining the whole code. – Arman Ozak Jan 09 '16 at 13:17

Arman Ozak · Answer 2 · 2016-01-09T13:14:46.343

1

This function does the job:

var brk = function(s,n){
    if(s.split && typeof n === "number") {
        var l = s.length,
            z = ~~(l/n),
            zx = (z*n<l) ? l-z*(n-1) : z;
            a = [];

        for(var i=0; i<n-1; i++) {
            a[i] = s.slice(i*z,i*z+z);
        }

        a[Math.ceil(n-1)] = s.slice(-zx);

        return a;
    } else {
        return false;
    }
};

You can test it with a console log:

console.log(brk("1234567890",3));

edited Jan 09 '16 at 13:14

answered Jan 09 '16 at 12:51

Arman Ozak

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String characters disappear in your solution. You can try e.g. `brk("1234567890", 7) //["1", "2", "3", "4", "5", "6", "90"]` – Alexander Elgin Jan 09 '16 at 12:57
You are right; edited the related line. I do not believe it deserves the down vote though. – Arman Ozak Jan 09 '16 at 13:02

Split string into array of n length

2 Answers2