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Given the following array a:
a = [1, 2, 3, 4, 5] How do I do:
a.map { |num| num + 1 } using the short notation:
a.map(&:+ 1) or:
a.map(&:+ 2) where 1 and 2 are the arguments?
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Passing Multiple Arguments to map() function Suppose we pass n iterable to map(), then the given function should have n number of arguments. These iterable arguments must be applied on given function in parallel. In multiple iterable arguments, when shortest iterable is drained, the map iterator will stop.
Using the Python map() function with multiple arguments functions. Besides using the Python map() function to apply single argument functions to an iterable, we can use it to apply functions with multiple arguments.
The map function has two arguments (1) a function, and (2) an iterable. Applies the function to each element of the iterable and returns a map object. The function can be (1) a normal function, (2) an anonymous function, or (3) a built-in function.
In this case you can do
a.map(&1.method(:+)) But only because 1 + x is usually the same as x + 1.
Here is a discussion of this practice in a performance context.
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