combining several arrays to form a single array

Question

combining several arrays to form a single array

Can someone assist me with the property five.myArraysCombined?

I want this property to consist of just one array (as it currently does in the fiddle) and I need to ensure that no numbers are added together. Each number in the array should not exceed 20, similar to the other arrays.

http://jsfiddle.net/Dc6HN/1/

For instance, if we have these five arrays:

five.myArray1 = [7,2,9,19,3];
five.myArray2 = [6,18,8,1,7];
five.myArray3 = [7,19,4,8,2];
five.myArray4 = [11,9,1,14,5];
five.myArray5 = [3,18,8,9,2];

Then when combined, the arrays would look like this:

five.myArraysCombined = [7,2,9,19,3,6,18,8,1,7,7,19,4,8,2,11,9,1,14,5,3,18,8,9,2];

Code Snippet :

function theNumberClass() {
    this.myArray = [[],[],[],[],[]];
    this.myArraysCombined = [];
}
var five = new theNumberClass();

function prePickNumbers(objName, theNum, theSumNum, theMaxNum, theMinNum) {
    var zzz = [];
    for (var x = 0; x < theNum; x += 1) {
    pickNumbers(objName.myArray[x], theNum, theSumNum, theMaxNum, theMinNum);
      zzz += objName.myArray[x];
    }
    objName.myArraysCombined.push(zzz);
}

prePickNumbers(five, 5, 40, 20, 1);

My recent attempt involved using var zzz and pushing it to the property, but it sometimes adds up the numbers in the array, which is not desired.

I've also experimented with various approaches utilizing .concat(), but it has resulted in converting it into a string and occasionally adding up the numbers as well.

javascript arrays

Answer 1

Answer №1

Imagine you have three arrays:

var x = [7, 8, 9]
var y = [10, 11, 12]
var z = [14]

You can combine all these arrays using either

var combined = [].concat.apply([],[x,y,z])

or with

var combined = [x,y,z].reduce(function(result, array){ return result.concat(array) })

Both methods will give you the resulting array:

[7, 8, 9, 10, 11, 12, 14]

The first approach is more straightforward, while the second one offers more flexibility if you need to perform actions like removing duplicates or applying filters/transformations.

Answer 2

Imagine you have three arrays:

var x = [7, 8, 9]
var y = [10, 11, 12]
var z = [14]

You can combine all these arrays using either

var combined = [].concat.apply([],[x,y,z])

or with

var combined = [x,y,z].reduce(function(result, array){ return result.concat(array) })

Both methods will give you the resulting array:

[7, 8, 9, 10, 11, 12, 14]

The first approach is more straightforward, while the second one offers more flexibility if you need to perform actions like removing duplicates or applying filters/transformations.

Answer 3

Answer №2

It seems that the issue lies with the use of the "+=" operator in this code snippet. This particular operator is meant for summing values, not for adding new elements to an array. Consider the following line of code:

zzz += objName.myArray[x];

My interpretation is that instead of appending "myArray[x]" to the end of the array, it is being added to the value of zzz. In JavaScript, when adding elements to an array, the best practice is to use the push method. Therefore, a more appropriate way to write this line would be:

zzz.push(objName.myArray[x]);

The original question may have been a bit unclear, but I hope this explanation proves helpful nonetheless.

Answer 4

It seems that the issue lies with the use of the "+=" operator in this code snippet. This particular operator is meant for summing values, not for adding new elements to an array. Consider the following line of code:

zzz += objName.myArray[x];

My interpretation is that instead of appending "myArray[x]" to the end of the array, it is being added to the value of zzz. In JavaScript, when adding elements to an array, the best practice is to use the push method. Therefore, a more appropriate way to write this line would be:

zzz.push(objName.myArray[x]);

The original question may have been a bit unclear, but I hope this explanation proves helpful nonetheless.

Answer 5

Answer №3

Using the five.reduce method, we are able to concatenate all elements in the array into a single array of numbers.

By utilizing this technique, the original array is reduced to a simpler form for easier manipulation and analysis. For more information on how to use the Array.reduce() method, you can refer to the MDN documentation.

Answer 6

Using the five.reduce method, we are able to concatenate all elements in the array into a single array of numbers.

By utilizing this technique, the original array is reduced to a simpler form for easier manipulation and analysis. For more information on how to use the Array.reduce() method, you can refer to the MDN documentation.

Answer 7

Answer №4

After countless hours experimenting with various suggestions found in multiple threads, I have finally stumbled upon a remarkably simple solution that works flawlessly for my needs.

http://jsfiddle.net/Dc6HN/2/

function prePickNumbers(objName, theNum, theSumNum, theMaxNum, theMinNum) {
    for (var x = 0; x < theNum; x += 1) {
    pickNumbers(objName.myArray[x], theNum, theSumNum, theMaxNum, theMinNum);
    objName.myArraysCombined.push(objName.myArray[x]);
}
   objName.myArraysCombined = objName.myArraysCombined.toString();
   objName.myArraysCombined = objName.myArraysCombined.split(',');
}

Answer 8

After countless hours experimenting with various suggestions found in multiple threads, I have finally stumbled upon a remarkably simple solution that works flawlessly for my needs.

http://jsfiddle.net/Dc6HN/2/

function prePickNumbers(objName, theNum, theSumNum, theMaxNum, theMinNum) {
    for (var x = 0; x < theNum; x += 1) {
    pickNumbers(objName.myArray[x], theNum, theSumNum, theMaxNum, theMinNum);
    objName.myArraysCombined.push(objName.myArray[x]);
}
   objName.myArraysCombined = objName.myArraysCombined.toString();
   objName.myArraysCombined = objName.myArraysCombined.split(',');
}

combining several arrays to form a single array

Answer №1

Answer №2

Answer №3

Answer №4

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