String#concat, Array#concat and String#prepend Now takes multiple arguments.

24 Mar 2017 | category: ruby-2.4.0 | Comments
#ruby #tech

Now String#concat, Array#concat and String#prepend

• String#concat

• 
        # Before 2.4.0
  
        irb(main):004:0> "Zambre".concat(" ", "Vishal", " ", "M")
        ArgumentError: wrong number of arguments (given 4, expected 1)
          from (irb):4:in `concat`
          from (irb):4
          from /home/vishalz/.rvm/rubies/ruby-2.3.1/bin/irb:11:in `<main>`
        irb(main):005:0>
  
        # In 2.4.0
  
        irb(main):022:0> "Zambre".concat(" ", "Vishal", " ", "M")
        => "Zambre Vishal M"
        irb(main):023:0>
      

• Array#concat

• 
        # Before 2.4.0
  
        irb(main):002:0> [1,2].concat([3],[4,5])
        ArgumentError: wrong number of arguments (given 2, expected 1)
          from (irb):2:in `concat'
          from (irb):2
          from /home/vishalz/.rvm/rubies/ruby-2.3.1/bin/irb:11:in `<main>'
        irb(main):003:0>
  
        # In 2.4.0
  
        irb(main):017:0> [1,2].concat([3],[4,5])
        => [1, 2, 3, 4, 5]
        irb(main):018:0>
      

• String#prepend

• 
        # Before 2.4.0
  
        irb(main):003:0> "Zambre".prepend("Vishal", " ", "M", " ")
        ArgumentError: wrong number of arguments (given 4, expected 1)
        	from (irb):3:in `prepend'
        	from (irb):3
        	from /home/vishalz/.rvm/rubies/ruby-2.3.1/bin/irb:11:in `<main>'
        irb(main):004:0>
  
        # In 2.4.0
  
        irb(main):021:0> "Zambre".prepend("Vishal", " ", "M", " ")
        => "Vishal M Zambre"
        irb(main):022:0>
      

Many thanks to Tsuyoshi Sawada for the feature!

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