Best way to generate empty 2D array

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7 Answers

arraygenerateempty
90%

int[][] multi = new int[5][];
multi[0] = new int[10];
multi[1] = new int[10];
multi[2] = new int[10];
multi[3] = new int[10];
multi[4] = new int[10];
88%

best way to generate 2D array in js by ES6 by Array.from,is there a shorter, better way to generate 'n' length 2D array?,Stack Overflow en español, Meta Stack Overflow

Another way:

for (var a = []; a.length < 10; a.push([])); // semicolon is mandatory here

Yet another way:

var a = [];
while (a.push([]) < 10);

That said, this is the wrong way of "reducing code". Create a dedicated function with a meaningful name and use this one. Your code will be much more understandable:

function get2DArray(size) {
   size = size > 0 ? size : 0;
   var arr = [];

   while (size--) {
      arr.push([]);
   }

   return arr;
}

var a = get2DArray(9);
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72%

hoe to write a generic code for creating a empty 2D array and dynamically insert values in it., I want to craete a empty double dimensional array. Later i will get the row and column length. But row length varies each time program. But i will be having the lenght of the row. So hoe to write a generic code for creating a empty 2D array and dynamically insert values in it.,It might benefit you to create a 2d array class to handle the many different aspects of working with a 2d array., We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts learning and sharing knowledge.

hoe to write a generic code for creating a empty 2D array and dynamically insert values in it.

>>> arr_2d = [
      []
   ] >>>
   arr_2d[0].append(0) >>>
   arr_2d[0].append(1) >>>
   arr_2d.append([3, 4, 5]) >>>
   arr_2d[[0, 1], [3, 4, 5]] >>>
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65%

Can you create 2 dimension array even when each sub array are not of equal lenght?,Ye you can. A 2D array is an array of arrays. Those arrays don't have to be of the same length., array - binary search ,Is it possible to create hetrogenous two dimensional array in Java? Since 2D array is array of array, can I have array containing String[], Integer [] and Object[] as sub array?


int[][] multiples = new int[4][2]; // 2D integer array with 4 rows 
and 2 columns
String[][] cities = new String[3][3]; // 2D String array with 3 rows 
and 3 columns
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75%

Online Free Tutorials Guruji Guide & Materials – Solved Questions Answers,is there a shorter, better way to generate ‘n’ length 2D array?,Emptying 2D array (saves memory rather), Tutorial Guruji

var a = (function() {
   var i = 9,
      arr = [];
   while (i--) arr.push([]);
   return arr
})();

a // [ [],[],[],[],[],[],[],[],[] ]
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40%

You can access any element of a 2D array using row number and column number.,In the code snippet below, we have not specified the number of rows and columns. However, the Java compiler is smart enough to manipulate the size by checking the number of elements inside the rows and columns.,We can use arr. length can be used to find the size of the rows (1st dimension), and arr[0].length can be to find the size of the columns (2nd dimension).,In the code snippet below, we have not specified the number of columns. However, the Java compiler is smart enough to manipulate the size by checking the number of elements inside the columns.

Syntax:

data_type array_name[][];
(OR) data_type[][] array_name;

Initialization of 2-D array in Java:

data_type[][] array_Name = new data_type[no_of_rows][no_of_columns];
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22%

How to create an empty 2D array in Python,This is how we can create empty array in python ,This is how we can create empty array in python.,This is how we can create empty 2D arrays in python.

Example:

my_list = [0] * 3
print(my_list)
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