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JavaScript - copy array with append item operation
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In this article, we would like to show you how to copy an array with appended item using JavaScript.
Quick solution:
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var myArray = [1, 2, 3];2
var newItem = 4;3
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var result = [].concat(myArray, newItem); // myArray.concat(newItem);5
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console.log(result); // [ 1, 2, 3, 4 ]
In this example, we create a reusable function that creates a copy of the given array with an item appended at the end.
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function appendItem(array, item) {2
return [].concat(array, item); // array.concat(item);3
}4
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// Usage example:7
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var array = [1, 2, 3];9
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var copy1 = appendItem(array, 4);11
var copy2 = appendItem(array, 5);12
var copy3 = appendItem(array, 6);13
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console.log(copy1); // [ 1, 2, 3, 4 ]15
console.log(copy2); // [ 1, 2, 3, 5 ]16
console.log(copy3); // [ 1, 2, 3, 6 ]
