How do I compare strings in GoLang

Question

I am unable to produce a  true  result when it comes to Go string comparison  I wrote the following to explain the issue and attached a screenshot of the output     string comparison in Go package main import  fmt  import  bufio  import  os   func main         var isLetterA bool       fmt Println  Enter the letter a       reader    bufio NewReader os Stdin      input       reader ReadString   n        if input     a             isLetterA   true       else           isLetterA   false             fmt Println  You entered  input      fmt Println  Is it the letter a   isLetterA

User · Answer

The content inside strings in Golang can be compared using == operator. If the results are not as expected there may be some hidden characters like \n, \r, spaces, etc. So as a general rule of thumb, try removing those using functions provided by strings package in golang.

For Instance, spaces can be removed using strings.TrimSpace function. You can also define a custom function to remove any character you need. strings.TrimFunc function can give you more power.

User · Answer

is the correct operator to compare strings in Go  However  the strings that you read from STDIN with reader ReadString do not contain  a   but  a n   if you look closely  you ll see the extra line break in your example output    You can use the strings TrimRight function to remove trailing whitespaces from your input   if strings TrimRight input    n       a

User · Answer

For the Platform Independent Users or Windows users  what you can do is   import runtime   import        runtime       strings      and then trim the string like this   if runtime GOOS     windows      input   strings TrimRight input    r n     else     input   strings TrimRight input    n       now you can compare it like that   if strings Compare input   a      0           yourCode     This is a better approach when you re making use of STDIN on multiple platforms   Explanation  This happens because on windows lines end with   r n  which is known as CRLF  but on UNIX lines end with   n  which is known as LF and that s why we trim   n  on unix based operating systems while we trim   r n  on windows

User · Answer

Assuming there are no prepending succeeding whitespace characters  there are still a few ways to assert string equality  Some of those are    strings ToLower     then    strings EqualFold         cases Lower paired with    cases Fold paired with      Here are some basic benchmark results  in these tests  strings EqualFold         seems like the most performant choice    goos  darwin goarch  amd64 BenchmarkStringOps both strings equal  equality op-4               10000        182944 ns op BenchmarkStringOps both strings equal  strings equal fold-4        10000        114371 ns op BenchmarkStringOps both strings equal  fold caser-4                10000       2599013 ns op BenchmarkStringOps both strings equal  lower caser-4               10000       3592486 ns op  BenchmarkStringOps one string in caps  equality op-4               10000        417780 ns op BenchmarkStringOps one string in caps  strings equal fold-4        10000        153509 ns op BenchmarkStringOps one string in caps  fold caser-4                10000       3039782 ns op BenchmarkStringOps one string in caps  lower caser-4               10000       3861189 ns op  BenchmarkStringOps weird casing situation  equality op-4           10000        619104 ns op BenchmarkStringOps weird casing situation  strings equal fold-4    10000        148489 ns op BenchmarkStringOps weird casing situation  fold caser-4            10000       3603943 ns op BenchmarkStringOps weird casing situation  lower caser-4           10000       3637832 ns op   Since there are quite a few options  so here s the code to generate benchmarks   package main  import        fmt       strings       testing        golang org x text cases       golang org x text language     func BenchmarkStringOps b  testing B        foldCaser    cases Fold       lowerCaser    cases Lower language English       tests      struct          description string         first  second string                              description   both strings equal               first   aaaa               second   aaaa                                    description   one string in caps               first   aaaa               second   AAAA                                    description   weird casing situation               first   aAaA               second   AaAa                         for    tt    range tests           b Run fmt Sprintf   s  equality op   tt description   func b  testing B                for i    0  i  lt  b N  i                     benchmarkStringEqualsOperation tt first  tt second  b                                    b Run fmt Sprintf   s  strings equal fold   tt description   func b  testing B                for i    0  i  lt  b N  i                     benchmarkStringsEqualFold tt first  tt second  b                                    b Run fmt Sprintf   s  fold caser   tt description   func b  testing B                for i    0  i  lt  b N  i                     benchmarkStringsFoldCaser tt first  tt second  foldCaser  b                                    b Run fmt Sprintf   s  lower caser   tt description   func b  testing B                for i    0  i  lt  b N  i                     benchmarkStringsLowerCaser tt first  tt second  lowerCaser  b                                    func benchmarkStringEqualsOperation first  second string  b  testing B        for n    0  n  lt  b N  n                 strings ToLower first     strings ToLower second           func benchmarkStringsEqualFold first  second string  b  testing B        for n    0  n  lt  b N  n                 strings EqualFold first  second           func benchmarkStringsFoldCaser first  second string  caser cases Caser  b  testing B        for n    0  n  lt  b N  n                 caser String first     caser String second           func benchmarkStringsLowerCaser first  second string  caser cases Caser  b  testing B        for n    0  n  lt  b N  n                 caser String first     caser String second

[go] How do I compare strings in GoLang?

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