Apply operations on a collection in Julia – map() and map!() Methods
The map() is an inbuilt function in julia which is used to transform the specified collection by using specified operation to each element.
Syntax: map(f, c…)
Parameters:
- f: Specified operation.
- c: Specified collection.
Returns: It returns the transformed elements.
Example:
# Julia program to illustrate # the use of map() method # Getting the transformed elements. println(map(x -> x * 2, [5, 10, 15])) println(map(+, [1, 2, 3], [10, 20, 30])) println(map(x -> x / 5, [5, 10, 15])) println(map(-, [10, 20, 30], [1, 2, 3])) |
Output:
[10, 20, 30] [11, 22, 33] [1.0, 2.0, 3.0] [9, 18, 27]
map!()
The map!() is an inbuilt function in julia. This function is same as map() function but stores the result in destination rather than a new collection. The destination must be at least as large as the first collection.
Syntax:
map!(function, destination, collection…)Parameters:
- function: Specified operation.
- destination: The destination where the result get stored.
- collection: Specified collection.
Returns: It returns the transformed elements.
Example:
# Julia program to illustrate # the use of map !() method # Getting the transformed elements. a = zeros(3); map !(x -> x * 3, a, [1, 2, 3]); println(a) b = ones(3); map !(x -> x / 3, b, [3, 6, 9]); println(b) |
Output:
[3.0, 6.0, 9.0] [1.0, 2.0, 3.0]