How do I find if a string starts with another string in Ruby

Question

What the best way to find if a string starts with another in Ruby  without rails

User · Answer

puts  abcdefg  start with   abc       gt  true    edit  This is something I didn t know before this question  start with takes multiple arguments    abcdefg  start with    xyz    opq    ab

User · Answer

I like  if   string    str

User · Answer

The method mentioned by steenslag is terse  and given the scope of the question it should be considered the correct answer  However it is also worth knowing that this can be achieved with a regular expression  which if you aren t already familiar with in Ruby  is an important skill to learn    Have a play with Rubular  http   rubular com   But in this case  the following ruby statement will return true if the string on the left starts with  abc   The  A in the regex literal on the right means  the beginning of the string   Have a play with rubular - it will become clear how things work    abcdefg        Aabc

User · Answer

Since there are several methods presented here  I wanted to figure out which one was fastest  Using Ruby 1 9 3p362   irb main  001 0 gt  require  benchmark    gt  true irb main  002 0 gt  Benchmark realtime   1 upto 10000000     foobar    Afoo        gt  12 477248 irb main  003 0 gt  Benchmark realtime   1 upto 10000000     foobar       Afoo       gt  9 593959 irb main  004 0 gt  Benchmark realtime   1 upto 10000000     foobar   foo        gt  9 086909 irb main  005 0 gt  Benchmark realtime   1 upto 10000000     foobar  start with   foo        gt  6 973697   So it looks like start with  ist the fastest of the bunch   Updated results with Ruby 2 2 2p95 and a newer machine   require  benchmark  Benchmark bm do  x    x report  regex          10000000 times    foobar    Afoo        x report  regex          10000000 times    foobar       Afoo       x report                 10000000 times    foobar   foo        x report  start with     10000000 times    foobar  start with   foo      end              user       system     total       real regex       4 020000   0 000000   4 020000    4 024469  regex       3 160000   0 000000   3 160000    3 159543              2 930000   0 000000   2 930000    2 931889  start with  2 010000   0 000000   2 010000    2 008162

[ruby] How do I find if a string starts with another string in Ruby?

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