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Reverse array elements in Julia - reverse(), reverse!() and reverseind() Methods

Last Updated : 01 Apr, 2020
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The reverse() is an inbuilt function in julia which is used to reverse the specified vector v from start to stop.
Syntax: reverse(v, start, stop) or reverse(A; dims::Integer) Parameters:
  • v: Specified vector.
  • start: Specified starting value.
  • stop: Specified stopping value.
  • A: Specified array.
  • dims::Integer: Specified dimensions.
Returns: It returns a reversed copy of the vector.
Example 1: Python 
# Julia program to illustrate 
# the use of reverse() method
 
# Getting the reversed copy of 
# the specified vector.
A = Vector(2:8)
println(reverse(A))
println(reverse(A, 3, 6))
println(reverse(A, 7, 4))
Output: 
[8, 7, 6, 5, 4, 3, 2]
[2, 3, 7, 6, 5, 4, 8]
[2, 3, 4, 5, 6, 7, 8]
Example 2: Python 
# Julia program to illustrate 
# the use of reverse() method
 
# Getting reversed array in 
# the specified dimension
A = [5 10; 15 20]
println(reverse(A, dims = 1))
println(reverse(A, dims = 2))
Output:

reverse!()

The reverse!() is an inbuilt function in julia which is In-place version of reverse() function.
Syntax: reverse!(v, start, stop) Parameters:
  • v: Specified vector.
  • start: Specified starting value.
  • stop: Specified stopping value.
Returns: It returns a reversed copy of the vector.
Example: Python 
# Julia program to illustrate 
# the use of reverse !() method
 
# Getting the reversed copy of 
# the specified vector.
A = Vector(2:8)
println(reverse !(A))
println(reverse !(A, 3, 6))
Output: 
[8, 7, 6, 5, 4, 3, 2]
[8, 7, 3, 4, 5, 6, 2]

reverseind

The reverseind() is an inbuilt function in julia which is used to return the corresponding index in v so that v[reverseind(v, i)] == reverse(v)[i], where i is the given index.
Syntax: reverseind(v, i) Parameters:
  • v: Specified string.
  • i: Specified index.
Returns: It returns the corresponding index in v so that v[reverseind(v, i)] == reverse(v)[i].
Example: Python 
# Julia program to illustrate 
# the use of reverseind() method
 
# Getting the corresponding index in v
# so that v[reverseind(v, i)] == reverse(v)[i]
V = reverse("Geeks")
for i in 1:length(r)
    print(V[reverseind("Geeks", i)])
end
Output:

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Set elements at a given index of array in Julia - setindex!() Method

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