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Get index of last true value of array in Julia | Array findlast() Method

Last Updated : 12 Jul, 2025
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The findlast() is an inbuilt function in julia which is used to return the index or key of the last true value in the specified array. Here values of index or key start from 1 i.e, for index of 1st element is 1, index of 2nd element is 2 and so on.
Syntax: findlast(A) or findlast(predicate::Function, A) Parameters:
  • A: Specified array
  • Predicate Function: Determines whether something is true or false based on the specified arguments
Returns: It returns the index or key of the last true value in the specified array.
Example 1: Python 
# Julia program to illustrate 
# the use of Array findlast() method
 
# Finding index of last true value from 
# the 1D array A
A = [false, true, true, false]
println(findlast(A))
 
# Finding index of last true value from 
# the 2D array B of size 2 * 2
B = [false false; true false]
println(findlast(B))
 
# Finding index of last true value from 
# the 3D array C of size 2 * 2*2
C = cat([false false; true false], 
        [false true; true false],
        [true false; true true], dims = 3)
println(findlast(C))
Output: Image Example 2: Python 
# Julia program to illustrate 
# the use of Array findlast() method
 
# Finding index of last even value from 
# the 1D array A
A = [1, 2, 5, 6]
println(findlast(iseven, A))
 
# Finding index of last even value from 
# the 2D array B of size 2 * 2
B = [3 5; 6 7]
println(findlast(iseven, B))
 
# Finding index of last even value from 
# the 3D array C of size 2 * 2*2
C = cat([1 2; 3 4], [5 6; 7 8], 
        [9 10; 11 12], dims = 3)
println(findlast(iseven, C))
Output: Image

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Kanchan_Ray
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