You can use methodsolver
to find Ruby functions.
Here is a small script,
require 'methodsolver'
solve { a = [1,2,3]; a.____(0) == [0,1,2,3] }
Running this prints
Found 1 methods
- Array#unshift
You can install methodsolver using
gem install methodsolver
array = ["foo"]
array.unshift "bar"
array
=> ["bar", "foo"]
be warned, it's destructive!
You can use insert
:
a = [1,2,3]
a.insert(0,'x')
=> ['x',1,2,3]
Where the first argument is the index to insert at and the second is the value.
Since Ruby 2.5.0, Array ships with the prepend
method (which is just an alias for the unshift
method).
You can also use array concatenation:
a = [2, 3]
[1] + a
=> [1, 2, 3]
This creates a new array and doesn't modify the original.
Source: Stackoverflow.com