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7.7 Multidimensional Arrays

7.7 Multidimensional Arrays


JavaScript does not support true multidimensional arrays, but you can approximate them with arrays of arrays. To access a value in an array of arrays, simply use the [] operator twice. For example, suppose the variable matrix is an array of arrays of numbers. Every element in matrix[x] is an array of numbers. To access a particular number within this array, you would write matrix[x][y]. Here is a concrete example that uses a two-dimensional array as a multiplication table:

// Create a multidimensional array var table = new Array(10); // 10 rows of the table for(var i = 0; i < table.length; i++)

table[i] = new Array(10); // Each row has 10 columns

// Initialize the array for(var row = 0; row < table.length; row++) { for(col = 0; col < table[row].length; col++) { table[row][col] = row*col; } }

// Use the multidimensional array to compute 5*7 var product = table[5][7]; // 35

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