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71 lines
2.0 KiB
Clojure
71 lines
2.0 KiB
Clojure
(ns koans.02-strings
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(:require [koan-engine.core :refer :all]
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[clojure.string :as string]))
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(meditations
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"A string is nothing more than text surrounded by double quotes"
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(= "hello" "hello")
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"But double quotes are just magic on top of something deeper"
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(= "world" (str 'world))
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"You can do more than create strings, you can put them together"
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(= "Cool right?" (str "Cool " "right?"))
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"You can even get certain characters"
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(= \C (get "Characters" 0))
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"Or even count the characters"
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(= 11 (count "Hello World"))
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"But strings and characters are not the same"
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(= false (= \c "c"))
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"What if you only wanted to get part of a string?"
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(= "World" (subs "Hello World" 6 11))
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"How about joining together elements in a list?"
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(= "123" (string/join '(1 2 3)))
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"What if you wanted to separate them out?"
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(= "1, 2, 3" (string/join ", " '(1 2 3)))
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"Maybe you want to separate out all your lines"
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(= [ "1" "2" "3" ] (string/split-lines "1\n2\n3"))
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"You may want to make sure your words are backwards"
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(= "olleh" (string/reverse "hello"))
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"Maybe you want to find the index of the first occurrence of a substring"
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(= 0 (string/index-of "hello world" "h"))
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"Or maybe the last index of the same"
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(= 13 (string/last-index-of "hello world, hello" "hello"))
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"But when something doesn't exist, nothing is found"
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(= nil (string/index-of "hello world" "bob"))
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"Sometimes you don't want whitespace cluttering the front and back"
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(= "hello world" (string/trim " \nhello world \t \n"))
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"You can check if something is a char"
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(= true (char? \c))
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"But it may not be"
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(= false (char? "a"))
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"But chars aren't strings"
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(= false (string? \b))
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"Strings are strings"
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(= true (string? "b"))
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"Some strings may be blank"
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(= true (string/blank? ""))
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"Even if at first glance they aren't"
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(= true (string/blank? " \n \t "))
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"However, most strings aren't blank"
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(= false (string/blank? "hello?\nare you out there?")))
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