85 lines
2.2 KiB
Julia
85 lines
2.2 KiB
Julia
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# Strings are made with double quotes ""
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# Single quotes '' are reserved for single characters (i.e. c/c++)
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s = "Hello world"
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println(s)
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# When converting to a string the function string (with lower case s)
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# is used.
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a = 3.14
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s = string(a)
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println(s) # Prints 3.14
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# The length of a string can be found with the length function
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# similar to len in python
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@show length(s)
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# The function String (with upper case S) is used for more direct
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# interpretation of data as a string
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a = UInt8[65, 66, 67] # ASCII codes for "ABC"
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println(String(a)) # Prints ABC
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println(string(a)) # Prints UInt8[0x41, 0x42, 0x43]
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# When converting from string to some numeric value, the parse function
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# is used. This function takes in the type to try to parse to as well
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# as the string to parse.
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s = "128"
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a = parse(Int, s)
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@show a
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s = "3.14"
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a = parse(Float64, s)
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@show a
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# Easy inline string formating can be done with the $ (eval) symbol
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a, b = 3, 5
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s = "a, b = $a, $b" # generates string "a, b = 3, 5"
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println(s)
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s = "a + b = $(a + b)" # "a + b = 8"
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println(s)
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# However it is usually faster (performance wise) to just pass in
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# multiple arguments to f.exs. println
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println("a + b = ", a + b)
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# The "raw" string macro is very useful when copying raw text and not
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# wanting to worry about special characters doing special stuff
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# (i.e. \n for new line). A common use for this is filepaths
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filepath = raw"C:\Users\somefolder\somefile.txt"
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@show filepath
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# String concatenation is, somewhat weirdly, done with the * sign
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# instead of the + sign. Julia's justification for this is that
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# addition (+) is reserved for commutative operations (a + b = b + a)
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# and since string concatenation is not commutative it gets the multiplication
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# symbol instead.
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s = "foo" * "bar"
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println(s)
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# This by extension means that if you want to repeat a string n times
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# this is done with the exponentiation (^) sign
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s = "foo"^5
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println(s)
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# To get input from the console this can be done with the readline() function
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# However getting console input when running in vscode with F5/shift+enter
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# seems to crash for some reason, so avoid console input if thats how you
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# run the program
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# s = readline()
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# println(s)
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