equalities and strings completed

This commit is contained in:
Oli Clive-Griffin 2021-06-03 13:31:49 +12:00
parent a9c22921a5
commit be01d1d320
2 changed files with 34 additions and 34 deletions

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@ -3,37 +3,37 @@
(meditations
"We shall contemplate truth by testing reality, via equality"
(= __ true)
(= true true)
"To understand reality, we must compare our expectations against reality"
(= __ (+ 1 1))
(= 2 (+ 1 1))
"You can test equality of many things"
(= (+ 3 4) 7 (+ 2 __))
(= (+ 3 4) 7 (+ 2 5))
"Some things may appear different, but be the same"
(= __ (= 2 2/1))
(= true (= 2 2/1))
"You cannot generally float to heavens of integers"
(= __ (= 2 2.0))
(= false (= 2 2.0))
"But a looser equality is also possible"
(= __ (== 2.0 2))
(= true (== 2.0 2))
"Something is not equal to nothing"
(= __ (not (= 1 nil)))
(= true (not (= 1 nil)))
"Strings, and keywords, and symbols: oh my!"
(= __ (= "hello" :hello 'hello))
(= (= "hello" :hello 'hello))
"Make a keyword with your keyboard"
(= :hello (keyword __))
(= :hello (keyword "hello"))
"Symbolism is all around us"
(= 'hello (symbol __))
(= 'hello (symbol "hello"))
"What could be equivalent to nothing?"
(= __ nil)
(= nil nil)
"When things cannot be equal, they must be different"
(not= :fill-in-the-blank __))
(not= :fill-in-the-blank :asdf))

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@ -4,67 +4,67 @@
(meditations
"A string is nothing more than text surrounded by double quotes"
(= __ "hello")
(= "hello" "hello")
"But double quotes are just magic on top of something deeper"
(= __ (str 'world))
(= "world" (str 'world))
"You can do more than create strings, you can put them together"
(= "Cool right?" (str __ __))
(= "Cool right?" (str "Cool" " right?"))
"You can even get certain characters"
(= \C (get "Characters" __))
(= \C (get "Characters" 0))
"Or even count the characters"
(= __ (count "Hello World"))
(= 11 (count "Hello World"))
"But strings and characters are not the same"
(= __ (= \c "c"))
(= false (= \c "c"))
"What if you only wanted to get part of a string?"
(= "World" (subs "Hello World" __ __))
(= "World" (subs "Hello World" 6 11))
"How about joining together elements in a list?"
(= __ (string/join '(1 2 3)))
(= "123" (string/join '(1 2 3)))
"What if you wanted to separate them out?"
(= "1, 2, 3" (string/join __ '(1 2 3)))
(= "1, 2, 3" (string/join ", " '(1 2 3)))
"Maybe you want to separate out all your lines"
(= [__ __ __] (string/split-lines "1\n2\n3"))
(= ["1" "2" "3"] (string/split-lines "1\n2\n3"))
"You may want to make sure your words are backwards"
(= __ (string/reverse "hello"))
(= "olleh" (string/reverse "hello"))
"Maybe you want to find the index of the first occurrence of a substring"
(= 0 (string/index-of "hello world" __))
(= 0 (string/index-of "hello world" "h"))
"Or maybe the last index of the same"
(= __ (string/last-index-of "hello world, hello" "hello"))
(= 13 (string/last-index-of "hello world, hello" "hello"))
"But when something doesn't exist, nothing is found"
(= __ (string/index-of "hello world" "bob"))
(= nil (string/index-of "hello world" "bob"))
"Sometimes you don't want whitespace cluttering the front and back"
(= __ (string/trim " \nhello world \t \n"))
(= "hello world" (string/trim " \nhello world \t \n"))
"You can check if something is a char"
(= __ (char? \c))
(= true (char? \c))
"But it may not be"
(= __ (char? "a"))
(= false (char? "a"))
"But chars aren't strings"
(= __ (string? \b))
(= false (string? \b))
"Strings are strings"
(= true (string? __))
(= true (string? "asdf"))
"Some strings may be blank"
(= __ (string/blank? ""))
(= true (string/blank? ""))
"Even if at first glance they aren't"
(= __ (string/blank? " \n \t "))
(= true (string/blank? " \n \t "))
"However, most strings aren't blank"
(= __ (string/blank? "hello?\nare you out there?")))
(= false (string/blank? "hello?\nare you out there?")))