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Code/18.Unicode.jl

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+# Julia uses unicode characters quite heavily. Mostly it is possible to avoid
+# using unicode completely, but it can make code look quite clean.
+# The unicode autocompletion for vscode mostly works, but can be a bit
+# unreliable, but the julia REPL (console) is also useful for writing unicode.
+# There is a whole section in the Julia docs dedicated to how to input different
+# unicode characters, so just search "Unicode Input" in the docs.
+
+# We've seen a lot of different unicode symbols, here are some more useful ones.
+
+# The infix operator for boolean xor is the ⊻ (\veebar, \xor) symbol.
+b = true ⊻ false
+
+# In the LinearAlgebra package the ⋅ (\cdot) symbol is overloaded as the
+# scalar product of vectors.
+using LinearAlgebra
+a = [1, 2] ⋅ [2, 1]
+@show a
+
+# Where you would write "in" you could probably use either ∈ (\n) or ∉ (\notin)
+
+# You can use ∈ for iteration
+for i ∈ 1 : 5
+    # dostuff
+end
+
+# It can also be used for checking if an element is in a collection
+3 ∈ [1, 2, 3, 4]
+# And the notin symbol can be used to check if something isn't in the collection
+2 ∉ [1, 2, 3, 4]
+
+# The mathematical constants π (\pi) and ℯ (\euler) are defined as irrationals
+# that can be cast to a numeric type and they will be calculated to the
+# required precision.
+
+# This calculates pi the the precision of a Float64
+p = Float64(π)
+@show p
+
+# This will calculate the fraction closest to ℯ using Int16.
+e = Rational{Int16}(ℯ)
+@show e