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Tuples in Julia
  • Last Updated : 27 Feb, 2020

Tuples in Julia are an immutable collection of distinct values of same or different datatypes separated by commas. Tuples are more like arrays in Julia except that arrays only take values of similar datatypes. The values of a tuple can not be changed because tuples are immutable. Tuples are a heterogeneous collection of values.

The sequence of values stored in a tuple can be of any type, and they are indexed by integers.
Values of a tuple are syntactically separated by ‘commas’. Although it is not necessary, it is more common to define a tuple by closing the sequence of values in parentheses. This helps in understanding the Julia tuples more easily.

Syntax:

Tuple_name = (value1, value2, value3, ...)

Example:




# Julia program to define Tuples
  
# Creating an empty tuple
tupl1 = ()
println(isempty(tupl1))
  
# Creating a tuple with similar values
tupl2 = (1, 2, 4, 5)
println(tupl2)
  
# Creating a tuple with mixed values
tupl3 = (1, 2, 3, "Hello Geeks")
println(tupl3)

Output:
Tuples-Julia-Output-01



Accessing elements from a tuple

Elements of a tuple can be easily extracted with the use of square brackets([]). Loops can also be used to extract more tha one element from a tuple. Also, a range of elements can also be extracted from a tuple by passing a range within square brackets just like strings.

Example:




# Julia program to access elements
# from a Tuple
  
# Creating a tuple
tupl = ("Hello", "Geeks", 1, 2, 3, "Welcome")
  
# Accessing tuple elements
println(tupl[2])
  
# Accessing a range of elements
println(tupl[1:3])
  
# Using for loop to iterate over tuple
for i in tupl
    println(i)
end

Output:
Tuples-Julia-Output-02

Operations on Tuples

Tuples allow performing various operations on them as per user needs. These operations can be like reverse, length, map, isempty, etc.




# Julia program to access elements
# from a Tuple
  
# Creating a tuple
tupl = ("Hello", "Geeks", 1, 2, 3, "Welcome")
  
# Reversing tuple
Rev_tupl = reverse(tupl)
println(Rev_tupl)
  
# Printing Tuple length
println(length(tupl))
  
# Using map operator
println(map(typeof, tupl))
  
# Checking if tuple is empty
println(isempty(tupl))

Output:
Tuples-Julia-Output-03

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