How to convert Single Dimension array into a column vector in JS

Question

I want a column vector as my output but instead getting a single dimension array. Please check the code in the fiddle. What have I done wrong?

My Current and Expected output are:

Current Output: Array [ 0, 1 ] Array [ 5, 10 ]

Expected Output: Array [ 0 ] Array [ 1 ] Array [ 5 ] Array [ 10 ]

Please check Browser Console.

How can I get my Expected Output?

Js Fiddle: https://jsfiddle.net/4o1dj1uw/2/

Code:

this.b = [[[0,1]],[[5,10]]];
function convertarray(arrToConvert) {
   //it will convert a matrix in array
   var newArr = [];
   for (var i = 0; i < arrToConvert.length; i++) {
        newArr = newArr.concat(arrToConvert[i]);
   }
   return newArr;
 }

console.log(...convertarray(this.b))

Just put it twice through convertarray(): console.log(convertarray(convertarray(this.b))) I'm not sure if that's what you want, but the result is one array — Highmastdon
– Highmastdon, Commented Mar 16, 2018 at 12:35
Is this a one time thing or do you see yourself doing this multiple times throughout the code? — Matt
– Matt, Commented Mar 16, 2018 at 13:40
Thank you! the array in this.b is actually inputted by the user. So I need individual array of all elements given as input. This needs to happen only once. — mit katwala
– mit katwala, Commented Mar 21, 2018 at 6:22

Ele · Accepted Answer · 2018-03-16 13:38:55Z

2

Almost there, you need to enter to the deepest array.

An alternative is using recursion.

this.b = [[[0,1]],[[5,10]]];
function convertarray(arrToConvert) {
   //it will convert a matrix in array
   var newArr = [];
   for (var i = 0; i < arrToConvert.length; i++) {
        if (Array.isArray(arrToConvert[i])) {
          newArr = newArr.concat(convertarray(arrToConvert[i]));
        } else {
          newArr.push([arrToConvert[i]]);
        }
   }
   return newArr;
 }

console.log(JSON.stringify(convertarray(this.b)))

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

edited Mar 16, 2018 at 13:38

answered Mar 16, 2018 at 12:37

Ele

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1 Comment

mit katwala Over a year ago

Hi @Ele Recursion is a good idea but this would not give me an array for every element in this.b right?

Highmastdon · Accepted Answer · 2018-03-16 12:37:08Z

1

Push it twice through convertarray():

console.log(convertarray(convertarray(this.b)))

If you want to get an array of each item of these you can do:

console.log(...convertarray(convertarray(this.b)).map(x => [x]));

Result

[0] [1] [5] [10]

answered Mar 16, 2018 at 12:37

Highmastdon

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2 Comments

mit katwala Over a year ago

Thanks a lot @Highmastdon this method worked for me. Actually in my code [0,1] and [5,10 ]is given by user so suppose if he only enters an integer instead of an array, will this code still work?

Highmastdon Over a year ago

If he only passes integers you have not the second dimension in the array. Therefore you wouldn't need to do it twice. You'd have to check wether the array is three-dimensional. Could be done something like this: Array.isArray(arrToConvert[0][0]). When this is true you have the three dimensional array, otherwise a two dimensional one.

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