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2019-first-word.go
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2019-first-word.go
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// source: https://programmingpraxis.com/2019/01/25/first-word/
//
// First Word by programmingpraxis
//
// We have a simple exercise today, inspired a co-worker. Where I work, we have
// a reporting tool that permits a "hook" to the underlying SQL in some places.
// My co-worker asked me how to write an SQL statement that extracts the first
// word (a maximal sequence of non-spaces) from the beginning of a string
// (assume there are no leading spaces). For instance, given the string "abcdefg
// hijklmnop qrs tuv wxyz" the first word is "abcdefg". Here's the SQL
// expression, wrapped in a select statement, with &&STR representing the
// string:
//
// select substr('&&STR', 1, instr('&&STR', ' ') - 1) from dual
//
// Your task is to write a program to extract the first word from a string.
package main
import (
"fmt"
"regexp"
)
func main() {
s1 := "abcdefg hijklmnop qrs tuv wxyz"
s2 := "~hola caracola de piazzolla"
fmt.Println(firstWordWithLoop(s1))
fmt.Println(firstWordWithRegexp(s1))
fmt.Println()
fmt.Println(firstWordWithLoop(s2))
fmt.Println(firstWordWithRegexp(s2))
}
func firstWordWithLoop(str string) string {
word := ""
for _, char := range str {
if char == ' ' {
break
}
word += string(char)
}
return word
}
func firstWordWithRegexp(str string) string {
return regexp.MustCompile(`[^ ]+`).FindString(str)
}