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JavaScript - does sort method modify original array?
1 answers
0 points
Does sort() method modify the original array?
I have the following piece of code:
xxxxxxxxxx1
let array = [{ id: 1 }, { id: 3 }, { id: 2 }];2
3
array = array.sort(function(a, b) {4
return a.id > b.id;5
});6
7
console.log(JSON.stringify(array));Should I redefine array or is it possible to just call sort() like presented below?
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array.sort(function(a, b) {2
return a.id > b.id;3
});Will the sort() method change the original array?
1 answer
0 points
The filter() method itself does mutate the original array. You can use slice() method to create copyt of the original array and then sort it.
Practical example:
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let array = [{ id: 1 }, { id: 3 }, { id: 2 }];2
3
let arrayCopy = array.slice();4
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arrayCopy.sort(function(a, b) {6
return a.id - b.id;7
});8
9
console.log(JSON.stringify(array)); // [{"id":1},{"id":3},{"id":2}]10
console.log(JSON.stringify(arrayCopy)); // [{"id":1},{"id":2},{"id":3}]Note:
Notice that you should use
a.id - b.idinstead ofa.id > b.idto sort an array.
References
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