Concatenate multiple arrays in a array of strings

Question

I have this multiple array:

var array = [["par0_0","par0_1","par0_2"],["par1_0","par1_1","par1_2"],["par2_0","par2_1","par2_2"]];

I would like to transform this array in the following array of strings:

var result = [["par0_0,par1_0,par2_0"],["par0_1,par1_1,par2_1"],["par0_2,par1_2,par2_2"]];

What is the most efficient way?

Is the first array an array of strings? are you missing double quotes? — Ahmed Nasser
– Ahmed Nasser, Commented Jul 10, 2015 at 7:11

Tushar · Accepted Answer · 2015-09-01 03:53:22Z

2

You can use toString() on array to convert the array values to string and concat them.

var myArr = [
  ['par0_0', 'par0_1', 'par0_2'],
  ['par1_0', 'par1_1', 'par1_2'],
  ['par2_0', 'par2_1', 'par2_2']
];

var myArrLen = myArr.length,
  myOutput = []; // The output array

for (var i = 0; i < myArrLen; i++) {
  var arrEl = []; // Initialize the array for inserting sub-array
  for (var j = 0; j < myArr[i].length; j++) {
    arrEl.push(myArr[j][i]); // Add items from same column into sub-array
  }

  myOutput[i] = [arrEl.toString()]; // Assign the string to output array
}
document.write(myOutput);
console.log(myOutput);

jsfiddle Demo

edited Sep 1, 2015 at 3:53

answered Jul 10, 2015 at 7:10

Tushar

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2 Comments

Tushar Over a year ago

@JosepBacardit What do you mean by that? Can you please create jsfiddle of the same

JosepB Over a year ago

In the first array of the result, I want to add the first value of all arrays. In the second array result I want to add the second value of all arrays. Here an example: jsfiddle.net/drzkzaxL/1

suvroc · Accepted Answer · 2015-07-10 07:15:26Z

1

You can also use reduce() function twice

[par0_0, par0_1, par0_2].reduce(function(previousValue, currentValue, index, array) {
   var result = "";
   if (index != 0)
   {
      result = ",";
   }
   return result + previousValue + currentValue;
});

edited Jul 10, 2015 at 7:15

answered Jul 10, 2015 at 7:11

suvroc

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Comments

Ahmed Nasser · Accepted Answer · 2015-07-10 07:16:17Z

1

You can use join(). Here is an example:

var arr = [["par0_0","par0_1","par0_2"],
["par1_0","par1_1","par1_2"],
["par2_0","par2_1","par2_2"]]

for(var i = 0 ; i < arr.length; i++) {
    arr[i] = [arr[i].join()] ;
}

join() accepts an optional separator argument if you do not want to commas. Default separator is comma.

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/join

answered Jul 10, 2015 at 7:16

Ahmed Nasser

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