How to convert an array of strings to a 2-dimensional array?

Question

How do I convert this array :

let strArr = ["10100", "10111", "11111", "01010"];

into a 2-d array.

The 2-d array will be :-

How is 1 0 1 0 0 1 0 1 1 1 1 1 1 1 1 0 1 0 1 0 a 2d array? — pishpish
– pishpish, Commented Jul 22, 2018 at 19:07
It was lost in the formatting. (Hitting "edit" you could see what he meant but there's pending fix now so...) — SamVK
– SamVK, Commented Jul 22, 2018 at 19:09

Nina Scholz · Accepted Answer · 2018-07-22 19:18:07Z

3

You could get the iterables from string and map numbers.

var array = ["10100", "10111", "11111", "01010"],
    matrix = array.map(s => Array.from(s, Number));
    
console.log(matrix);

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Jul 22, 2018 at 19:18

Nina Scholz

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1 Comment

Jonas Wilms Over a year ago

... Array.from iterates over the characters of one of the strings, and then calls Number on each and returns the results as a new array, effectively turning "10010" into [1, 0, 0, 1, 0]

Pierre-Nicolas Piquin · Accepted Answer · 2018-07-22 19:12:01Z

0

If the result needs to be an array of array containing one element per character of a string, you can split each string with an empty string in a loop or map.

let res = [];
let strArr = ["10100", "10111", "11111", "01010"];
strArr.map((str) => {
    res.push(str.split(''))
});
console.log(res);

answered Jul 22, 2018 at 19:12

Pierre-Nicolas Piquin

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Comments

Kavian Rabbani · Accepted Answer · 2018-07-22 19:14:20Z

0

this way, you will have 2d array of zero and ones

const newArr = strArr.map((a) => a.split("").map(char => char === "0"? 0: 1))

answered Jul 22, 2018 at 19:14

Kavian Rabbani

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Comments

pretzelhammer · Accepted Answer · 2018-07-22 19:18:34Z

0

let strArr = ["10100", "10111", "11111", "01010"];
let numColumns = strArr[0].length;
let numRows = strArr.length;
let string = strArr.join('');
let result = [];

for (let row = 0; row < numRows; row++) {
  result.push([]);
  for (let column = 0; column < numColumns; column++) {
    result[row].push(parseInt(string.charAt(row*5 + column), 10));
  }
}

console.log(result);

answered Jul 22, 2018 at 19:18

pretzelhammer

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Comments

SamVK · Accepted Answer · 2018-07-22 19:23:58Z

0

Loop over each item and spread its content into an array - then convert to a number.

let newArr = strArr.map(item => [...item].map(Number));

edited Jul 22, 2018 at 19:23

answered Jul 22, 2018 at 19:12

SamVK

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Daniel Priest · Accepted Answer · 2018-07-22 19:25:55Z

0

let inArr = ["10100", "10111", "11111", "01010"];
let outArr = inArr.map( line => line.split("").map(  item =>  +item  ) );

console.log(outArr);

let inArr = ["10100", "10111", "11111", "01010"];
let outArr = inArr.map( line => line.split("").map(  item =>  +item  ) );

edited Jul 22, 2018 at 19:25

answered Jul 22, 2018 at 19:14

Daniel Priest

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