In the clojure.string namespace we can find several useful function for working with strings. If we want to trim a string we can choose for the trim, trial, trimr and trim-newline functions. To trim all characters before a string we must use the triml function. To remove all space characters after a string we use trimr. To remove space characters both before and after a string we can use the trim function. Finally if we only want to remove the newline and/or return characters we use the trim-newline function.
In the following example we use the different trim functions on strings:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | (ns mrhaki.sample (:require [clojure.test :refer [is]] [clojure.string :refer [trim triml trimr trim-newline]]));; The trim function removes spaces before and after the string.(is (= "mrhaki" (trim " mrhaki ")));; Tabs are also trimmed.(is (= "mrhaki" (trim "\t mrhaki ")));; Return and/or newline characters are also trimmed.(is (= "mrhaki" (trim "\tmrhaki \r\n")));; Character literals that should be trimmed are trimmed.(is (= "mrhaki" (trim (str \tab \space " mrhaki " \newline))));; The triml function removes spaces before the string (trim left).(is (= "mrhaki " (triml " mrhaki ")))(is (= "mrhaki " (triml "\t mrhaki ")))(is (= "mrhaki " (triml "\nmrhaki ")))(is (= "mrhaki " (triml (str \return \newline " mrhaki "))));; The trimr function removes spaces after the string (trim right).(is (= " mrhaki" (trimr " mrhaki ")))(is (= " mrhaki" (trimr " mrhaki\t")))(is (= " mrhaki" (trimr (str " mrhaki " \newline))));; The trim-newline function removes only newline from string.(is (= "mrhaki " (trim-newline (str "mrhaki " \newline))))(is (= "mrhaki " (trim-newline (str "mrhaki " \return \newline))))(is (= "mrhaki " (trim-newline "mrhaki \r\n")))(is (= "mrhaki " (trim-newline "mrhaki "))) |
Written with Clojure 1.10.1.
