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Add information about type hierarchy
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Mo8it
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1 changed files with 55 additions and 10 deletions
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@ -318,33 +318,33 @@ In Julia, indexing starts with 1️⃣
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# ⚠️ This results in an error!
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# first_vector[0]
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# ╔═╡ 7c00f22c-860f-4bb1-b4b4-74c5c3c70f45
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# Last element
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first_vector[end]
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# ╔═╡ 45b64c7a-850b-402c-b7ce-2a0bf6d77060
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# ⚠️ No negative indexing, too!
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# ⚠️ No negative indexing!
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# first_vector[-1]
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# ╔═╡ d1ed1515-cd59-4e10-a15c-b64325bc44c2
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# Instead, this can be used
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first_vector[end-1]
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# ╔═╡ 7c00f22c-860f-4bb1-b4b4-74c5c3c70f45
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# Last element
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first_vector[end]
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# ╔═╡ 6c80e009-30de-4232-9a1b-ac954242a5a6
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md"""
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### Slicing
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"""
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# ╔═╡ b1426df5-a083-4977-a72c-81e03fd7719d
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# start:end
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first_vector[2:end]
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# Syntax: start_index:end_index
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first_vector[2:4]
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# ╔═╡ 5b16ca43-1f56-4934-a420-5ffa5ed437ec
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# start:step:end
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# start_index:step:end_index
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first_vector[1:2:end]
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# ╔═╡ 628852dc-16e5-4a03-93a9-be209b1e8fb4
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# List of indices
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# Vector of indices
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first_vector[[1, end, 2]]
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# ╔═╡ 3ea54f0d-2aa5-47a3-bbc3-92023a56b834
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@ -352,6 +352,13 @@ md"""
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### Mutation
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"""
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# ╔═╡ 6fdc6add-a478-4707-876b-cf6d660870ba
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md"""
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From now on, blocks will be used sometimes when manipulating an array to prevent dependency on execution order.
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A block starts with `begin` and ends with `end`. Code in the block should be indented.
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"""
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# ╔═╡ e9e117af-1194-4d64-94a8-3e9fd51498aa
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# Setting the first element to 3
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begin
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@ -368,9 +375,11 @@ third_vector = [1, 2, 3]
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# third_vector[2] = 42.1
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# ╔═╡ 65d3ddc2-36ed-4126-9211-e838ffc0d859
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# This is because the type of the array is Int64, a Float64 can not be inserted! All elements of an array have to have the same type!
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typeof(third_vector)
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# ╔═╡ 641e8c05-3e80-47e5-be77-91090a5f799a
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# You can mix types during initialization of an array
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begin
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mixed_vector = ["hi", 2.1, 55.7]
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mixed_vector[2] = 1 + 2im
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@ -378,8 +387,36 @@ begin
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end
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# ╔═╡ 2b9a5867-ca82-4a27-a700-bd0bd6c89bbe
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# But then, the type of the array is Any
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typeof(mixed_vector)
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# ╔═╡ 944e2d37-8280-47b8-b874-97221955d048
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md"""
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`Any` is the *abstract* type of everything.
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Julia does have abstract types which are helpful for multiple dispatch. More about multiple dispatch later 😉
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"""
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# ╔═╡ 23d4ac67-05ec-4b3d-8368-86256076be62
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# The type hierarchy
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supertypes(Int64)
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# ╔═╡ 866edf5e-a76c-448d-98e8-925eaed5eba5
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subtypes(Number)
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# ╔═╡ a8ea4ac1-7f62-4485-a8c5-8ccf00c45720
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subtypes(Real)
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# ╔═╡ 786a96be-16cd-4f1b-9b5f-138e232d3183
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subtypes(Integer)
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# ╔═╡ dd8dad86-6bc2-4489-8469-7eac80fc41bb
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subtypes(Signed)
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# ╔═╡ c336d5f6-80ee-4994-a55f-2d6b3aa3d559
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# Hierarchy of Float64
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supertypes(Float64)
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# ╔═╡ 87b43f26-7437-4ee9-9b83-5b21e86dd0c9
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md"""
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⚠️ Try to avoid using mixed arrays (type `Any`)!
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@ -761,20 +798,28 @@ uuid = "3f19e933-33d8-53b3-aaab-bd5110c3b7a0"
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# ╠═8c47710f-1ed2-40fd-9290-374b498380e3
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# ╟─a03b46cc-1b26-44c2-b83d-884e3dbbe4fa
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# ╠═68658408-188e-43f7-ad74-251172dec0a8
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# ╠═7c00f22c-860f-4bb1-b4b4-74c5c3c70f45
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# ╠═45b64c7a-850b-402c-b7ce-2a0bf6d77060
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# ╠═d1ed1515-cd59-4e10-a15c-b64325bc44c2
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# ╠═7c00f22c-860f-4bb1-b4b4-74c5c3c70f45
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# ╟─6c80e009-30de-4232-9a1b-ac954242a5a6
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# ╠═b1426df5-a083-4977-a72c-81e03fd7719d
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# ╠═5b16ca43-1f56-4934-a420-5ffa5ed437ec
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# ╠═628852dc-16e5-4a03-93a9-be209b1e8fb4
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# ╟─3ea54f0d-2aa5-47a3-bbc3-92023a56b834
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# ╟─6fdc6add-a478-4707-876b-cf6d660870ba
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# ╠═e9e117af-1194-4d64-94a8-3e9fd51498aa
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# ╠═027313d6-c247-43e9-872b-c3f0fe71b733
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# ╠═e77e7ceb-31e3-4231-9923-f62b1382a2d1
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# ╠═65d3ddc2-36ed-4126-9211-e838ffc0d859
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# ╠═641e8c05-3e80-47e5-be77-91090a5f799a
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# ╠═2b9a5867-ca82-4a27-a700-bd0bd6c89bbe
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# ╟─944e2d37-8280-47b8-b874-97221955d048
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# ╠═23d4ac67-05ec-4b3d-8368-86256076be62
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# ╠═866edf5e-a76c-448d-98e8-925eaed5eba5
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# ╠═a8ea4ac1-7f62-4485-a8c5-8ccf00c45720
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# ╠═786a96be-16cd-4f1b-9b5f-138e232d3183
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# ╠═dd8dad86-6bc2-4489-8469-7eac80fc41bb
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# ╠═c336d5f6-80ee-4994-a55f-2d6b3aa3d559
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# ╟─87b43f26-7437-4ee9-9b83-5b21e86dd0c9
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# ╠═22f5ebc1-fd5c-4ee7-b169-8144fbd9b570
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# ╠═7479c420-2e04-4fe7-823c-3fde9efb54ca
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