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what is the use of << in ruby on integer and string object. I tried the following in irb

irb(main):001:0> a=1
=> 1
irb(main):002:0> b=3
=> 3
irb(main):003:0> a<<b
=> 8
irb(main):004:0> a+b
=> 4
irb(main):005:0> a="aa"
=> "aa"
irb(main):006:0> b="bb"
=> "bb"
irb(main):007:0> a<<b
=> "aabb"
irb(main):008:0> a+b
=> "aabbbb"
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  • Did you bother to read the documentation? Commented Nov 27, 2015 at 8:18

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On integers, it is the bit-shift-left operator: a << b is (barring overflows) equivalent to a * (2 ** b).

On strings and arrays, it is append (concatenate-to-this) operator.

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