What is the hash.shift method in Ruby?
Overview
The shift method of a hash is used to return the first hash entry of a hash.
Syntax
hash.shift
Parameters
This method does not take any parameters.
Return value
This method returns a 2-element array that contains the removed key and value.
Example
# create hashesh1 = {one: 1, two: 2, three: 3}h2 = {name: "okwudili", stack: "ruby"}h3 = {"foo": 0, "bar": 1}h4 = {M:"Mango", A: "Apple", B: "Banana"}# use the shift methodputs "#{h1.shift}"puts "#{h2.shift}"puts "#{h3.shift}"puts "#{h4.shift}"
Explanation
- Lines 2 to 5: We create several hashes.
- Lines 8 to 11: We print the results using the shift to return the first hash entry in a 2-element array containing the key and value
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