Convert javascript string to array

Question

I have string like this

    '10:00','13:00','12:00','15:00','08:00','12:00'

I need it in format like this

Array(3)

  Array[0] ['10:00', '13:00']
  Array[1] ['12:00', '15:00']
  Array[2] ['08:00', '12:00']

I tried with split method but without success.

"I tried with split method but without success." Please show your code. — str, Aug 31 '18 at 07:38
This might be helpful https://gist.github.com/webinista/11240585 — kgbph, Aug 31 '18 at 07:39
@kgbph You should *never* extend the prototypes of built-ins. E.g. never extend `Array.prototype`. — str, Aug 31 '18 at 07:40
@str Why not? It's perfectly fine to extend prototypes if well documented. And of course you need to take care of conflicts. But if someone extends prototypes he/she should know what they do anyway. — Akaino, Aug 31 '18 at 07:43
@Akaino [Why is extending native objects a bad practice?](https://stackoverflow.com/questions/14034180/why-is-extending-native-objects-a-bad-practice) — str, Aug 31 '18 at 07:48
@str I know that. But it also states `Changing the behaviour of an object that will only be used by your own code is fine.` So I still don't see a problem if you know what you're doing. Not saying it's good practice. — Akaino, Aug 31 '18 at 07:58
@Akaino The problem is that not many people know what it implies and how it can break their code. And there are many cases where it even influenced the development of ECMAScript in a bad way. For example, `Array.prototype.includes` is called `includes` because `contains` was already used by many libraries and the committee feared the incompatibilities. — str, Aug 31 '18 at 08:37

score 6 · Answer 1 · answered Aug 31 '18 at 07:42

You could replace single quotes with double quotes, add brackes and parse it as JSON and get an array, which is the grouped by two elements.

var string = "'10:00','13:00','12:00','15:00','08:00','12:00'",
    array = JSON
        .parse('[' + string.replace(/'/g, '"') + ']')
        .reduce((r, s, i) => r.concat([i % 2 ? r.pop().concat(s) : [s]]), []);

console.log(array);

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score 5 · Answer 2 · answered Aug 31 '18 at 07:40

var str = "'10:00','13:00','12:00','15:00','08:00','12:00'";
var oldArray = str.split(',');
var newArray = [];

while(oldArray.length){
    let start = 0;
    let end = 2;
    newArray.push(oldArray.slice(start, end));
    oldArray.splice(start, end);
 }
 
 console.log(newArray);

Angelos Chalaris · Answer 3 · 2018-09-14T13:53:48.197

You can use String.split(',') to split into individual values, then group them based on their positions (result of integer division with 2).

I am using groupBy from 30 seconds of code (disclaimer: I am one of the maintainers of the project/website) to group the elements based on the integer division with 2. Short explanation:

Use Array.map() to map the values of an array to a function or property name. Use Array.reduce() to create an object, where the keys are produced from the mapped results.

The result is an object, but can be easily converted into an array using Object.values() as shown below:

var data = "'10:00','13:00','12:00','15:00','08:00','12:00'";

const groupBy = (arr, fn) =>
  arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val, i) => {
    acc[val] = (acc[val] || []).concat(arr[i]);
    return acc;
  }, {});

var arr = data.split(',');
arr = groupBy(arr, (v, i) => Math.floor(i / 2));
arr = Object.values(arr);

console.log(arr);

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score 1 · Answer 4 · answered Aug 31 '18 at 07:48

1

How about:

"'10:00','13:00','12:00','15:00','08:00','12:00'"
.replace(/'/g, '').replace(/(,[^,]*),/g,"$1;")
.split(';').map(itm => itm.split(','))

answered Aug 31 '18 at 07:48

Stefan Blamberg

816
9
24

score 1 · Answer 5 · answered Aug 31 '18 at 07:49

In this case you want to compare 2 values. To do this you can make a for loop that reads the current value and the last value and compares the two. If the last value is higher than current value, the splitting logic happens.

Either you add the current value to the last item (which is an array of strings) in the results array or you add a new array of strings at the end of the results array.

InfiniteStack · Answer 6 · 2018-08-31T08:00:41.297

1

One potential solution:

let S = "'10:00','13:00','12:00','15:00','08:00','12:00'";

let R = S.split(',');

let I = 0;

let A = new Array([],[],[]);

R.map((object, index) => {
    A[I][index % 2] = R[index];
    if (index % 2 == 1) I++;
});

console.log(A);

edited Aug 31 '18 at 08:00

answered Aug 31 '18 at 07:54

InfiniteStack

430
2
9

score 0 · Answer 7 · answered Sep 03 '18 at 12:14

I think use JSON.parse is better:

var array = "'10:00','13:00','12:00','15:00','08:00','12:00'";

array = JSON.parse( '[' + array.replace(/'/g,'"') + ']' );

var array2 = [];
for(var i=0;i < array.length - 1; i++){
    array2.push([array[i], array[i+1]]);
}

console.log(array2);

Convert javascript string to array

7 Answers7