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How to Reverse an Array There are many ways of reversing an array, and here we consider 5. For Option 1, an array is reversed using an additional array filled in ascending order from the end of the original array descending , in Option 2 an in-place reversal is carried out where array elements at the beginning and end are swapped over, in Option 3, the reverse method from the Collections framework is used to do the reversal, in Option 4, List.
Option 1: Reversing an Array using an Additional Array Let us write a simple method to reverse an array using an additional array. This option uses an additional array which is filled starting with the last element of the original array in descending order, i. The argument to the method is the array. In method reverse , a new array, newArray , is created and is the same size as array , only completely empty. A for loop is used to fill in the newArray and operates over the whole length of the array.
This is done by starting with the first element of an array and assigning it to the last element of newArray , then taking the second element of our array and assigning it to the second last element of newArray , and so on; newArray is filled in backwards.
When the for loop is complete, newArray is completely full and is an exact reverse of the array. Array : [7, 8, 9, 10, 11] Reversed array : [11, 10, 9, 8, 7]. Array before reverse : [1, 4, 9, 16, 25] Array after reverse : [25, 16, 9, 4, 1]. Comments 1. Great Array data storage use case examples of the 'shrink wrapped' methods that come with the Java language for Array. But this basically change the original array, you can write a function and use it to return a new array instead, something like this:.
Highest score default Trending recent votes count more Date modified newest first Date created oldest first. Help us improve our answers. Are the answers below sorted in a way that puts the best answer at or near the top? Patrick Reck 11k 11 11 gold badges 49 49 silver badges 85 85 bronze badges. Andreas Wong Andreas Wong Heretic Monkey Rohit Shelhalkar Rohit Shelhalkar 1 1 gold badge 9 9 silver badges 15 15 bronze badges.
It should be noted that concat copies object references into the new array. Both the original and new array refer to the same object Nick B Nick B 1 1 gold badge 12 12 silver badges 31 31 bronze badges. Just lost half a day due to not realizing this was an in-place operation. Thank you for the help! Kangudie Muanza - Killmonger Kangudie Muanza - Killmonger 1, 9 9 silver badges 12 12 bronze badges. A good non-destructive solution. Note that slice does a shallow copy.
Community Bot 1 1 1 silver badge. Torkel Velure Torkel Velure 8 8 silver badges 14 14 bronze badges. When you pass on a function reference so without executing it , which is later used for execution, then that function reference has no trace at all of the object you want to have it executed on: it is just a plain function.
In the above code you might as well have put . When the implementation of map executes that function, it does not know on which array it should be executed. And if you don't tell that, it will fail. The second argument to map gives the necessary info to map. Quite clever but bear in mind that this will mutate your original array making it empty use a deep-freeze before, maybe — Radu Chiriac.
Show 3 more comments. Ali Mirzaei Ali Mirzaei 1, 1 1 gold badge 14 14 silver badges 26 26 bronze badges. Zach Barham 1 1 gold badge 8 8 silver badges 18 18 bronze badges. Faisal Ali Faisal Ali 1 1 silver badge 9 9 bronze badges. Use swapping and return the original array. Penny Liu Penny Liu Heres a functional way to do it.
Jake Boyles Jake Boyles 3 3 silver badges 3 3 bronze badges. Great and short solution if u don't want to change orig array! This is great if you are writing a pure function or don't want to mutate the original array for any other reason. Elia Grady Elia Grady 3 3 silver badges 14 14 bronze badges. Actually I was surprised to see it work the way it did. The idea is that it closely tied to how the sort method can take a sorting algorithm and since it does it one by one, it's always swaps.
The problem with this is that it might not reverse the array with different interpreters. I'm not suggesting this as a good practice, just thought it's an interesting, unconventional take on a well known operation. Smaillns Smaillns 1, 1 1 gold badge 17 17 silver badges 27 27 bronze badges. Trung Tran Trung Tran Rashid Iqbal Rashid Iqbal 9 9 silver badges 11 11 bronze badges.
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