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JavaScript - get column from two dimensional array
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In this article, we would like to show you how to get a column from a two-dimensional array in JavaScript.
In this example, we create a reusable function that loops through each element in the 2D array and returns the columnIndex column.
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function getColumn(array, columnIndex) {2
var result = new Array(array.length);3
for (var i = 0; i < array.length; ++i) {4
result[i] = array[i][columnIndex];5
}6
return result;7
}8
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// Usage example11
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var array = [13
['00', '01', '02'],14
['10', '11', '12'],15
['20', '21', '22'],16
];17
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console.log(getColumn(array, 0)); // [ '00', '10', '20' ]19
console.log(getColumn(array, 1)); // [ '01', '11', '21' ]20
console.log(getColumn(array, 2)); // [ '02', '12', '22' ]In this section, we use array map() method to get the columnIndex column from the array.
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const getColumn = (array, columnIndex) => array.map((element) => element[columnIndex]);2
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// Usage example5
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const array = [7
['00', '01', '02'],8
['10', '11', '12'],9
['20', '21', '22'],10
];11
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console.log(getColumn(array, 0)); // [ '00', '10', '20' ]13
console.log(getColumn(array, 1)); // [ '01', '11', '21' ]14
console.log(getColumn(array, 2)); // [ '02', '12', '22' ]
