Add more comments

Day_1/Day_1.jl

@@ -68,27 +68,33 @@ md"""
 5 / 2
 
 # ╔═╡ 02282f61-e1ca-483d-b6de-feeccedd7bc0
+# Remainder of division
 5 % 2
 
 # ╔═╡ e4237ccd-b042-408b-8177-4c0d31a28caa
+# Quotient of division
 5 ÷ 2
 
 # ╔═╡ d1bf37f9-5135-48b8-8f9b-84ddd4a86157
 md"""
 ## Variables
+
+Variables store data 📦️
 """
 
 # ╔═╡ 8d005ddd-0308-4a06-8bae-251387facf6f
+# Assignment
 a = 2
 
 # ╔═╡ b7d27cd4-a655-492e-b2b3-cdc745b2c2da
 b = 3
 
 # ╔═╡ 141950e5-e9f8-414b-b08d-86777428cbec
-# Change a or b above and see what happens
+# Change a or b above and see what happens 🪄
 a * b
 
 # ╔═╡ 2e7f29ce-3afa-4c12-838d-8051c0567e20
+# You can also store the result of a computation
 c = a + b
 
 # ╔═╡ 2121b949-06e7-4079-a25a-d0518ee2ba50
@@ -99,42 +105,80 @@ md"""
 - `Float16`, `Float32`, **`Float64`**
 - `Int8`, `Int16`, `Int32`, **`Int64`**, `Int128`
 - `UInt8`, `UInt16`, `UInt32`, `UInt64`, `UInt128`
+
+All other types (like strings) are composed.
+
+Spoiler: You can compose your own types! More about this later 😉
 """
 
 # ╔═╡ 534f3b32-1fc9-4eed-887a-2cac66c2bdb4
+# Bool
 bo = true
 
 # ╔═╡ f20de3db-f270-4c43-aab7-692c313b5fa9
+# Char
+# Single quotes!
 ch = 'c'
 
 # ╔═╡ c72f187f-9626-45d9-870a-267c8530202c
+# String, not a char!
+# Double quotes!
 st1 = "c"
 
+# ╔═╡ e4295349-fc5c-48cb-975e-803e44d1a06e
+# Shows the type of a variable
+typeof(ch)
+
+# ╔═╡ 7287122b-e5ea-4f69-963b-023483914992
+typeof(st1)
+
 # ╔═╡ 8b6609b0-5d6d-4c7d-a144-deaff79f93e9
+# A string is a chain of characters
 hello = "Hello world!"
 
+# ╔═╡ 196682db-f5e1-4c07-9d35-644da3eecdd6
+md"""
+Pluto notebooks automatically print the output of the cell.
+
+When using scripts instead of notebooks, `println` is needed.
+"""
+
 # ╔═╡ 10fdb32f-b66f-4c4e-abd9-e856549941b8
+# Print to the console
+# ln stands for new line which is printed at the end of the output
 println(hello)
 
 # ╔═╡ 00ba151b-a741-448d-b8bf-775217250915
+# Float
 fl = 42.0
 
+# ╔═╡ 204cf77f-bf37-4110-9c9f-1f9236301ba9
+# Float64 is the default
+typeof(fl)
+
 # ╔═╡ 750bba32-e695-48f1-af70-70c94d13366b
+# Integer
 meaning_of_life = 42
 
+# ╔═╡ 0b663bcb-4ff4-4597-b28b-b58c9cbfa181
+# Int64 is the default
+typeof(meaning_of_life)
+
 # ╔═╡ 608d4433-6e68-4f95-8581-437234b58e87
 md"""
-## Converting
+## Convertion
 """
 
 # ╔═╡ beadbfd3-0015-449a-b6e7-b5182b396c1d
+# Converting a float to an integer
 convert(Int64, 3.0)
 
 # ╔═╡ 552fafa4-fad5-4efe-895f-255b3ec5c858
+# Complex is a composed type for complex numbers
 convert(Complex, 3.0)
 
 # ╔═╡ d11fde7f-3238-4013-bd2d-546aab0d9f9c
-# This does not work!
+# This does not work! See rounding below.
 # convert(Int64, 3.2)
 
 # ╔═╡ 036a2c43-dbc9-487c-96aa-94324eeb4a52
@@ -143,10 +187,11 @@ md"""
 """
 
 # ╔═╡ 1e954726-254e-41bb-a62f-17bdc9884bee
-# We have to tell Julia explicitely what to do
+# We have to tell Julia explicitely what to do when converting a float with non zero digits after the decimal point.
 round(Int64, 3.2)
 
 # ╔═╡ d74f6c46-f5a8-4720-bcaf-936f1508efda
+# The default is rounding to 0 digits after the decimal points, but keeping the float type.
 round(π)
 
 # ╔═╡ 3e5daca6-5aa8-42bf-988b-c09fb17388df
@@ -185,6 +230,7 @@ md"""
 """
 
 # ╔═╡ 0596fe87-4201-476e-8e11-618c621c5474
+# Concatenation
 # ⚠️ Not +
 "Hello " * "world!"
 
@@ -192,21 +238,28 @@ md"""
 new_to_julia = "Hi, I am new to Julia!"
 
 # ╔═╡ da5fb1f9-2a2d-4148-8ba5-8c4a529829e9
+# check if a string is part of another one
 # ⚠️ Not in
 contains(new_to_julia, "Hi")
 
 # ╔═╡ 943da836-384d-4774-aaf4-54c27feb53d8
+# Split on occurrences of the provided delimeneter (comma here)
 split(new_to_julia, ",")
 
 # ╔═╡ a96f3ae9-12df-4df8-85da-09b9b1e47de1
-join(["Hello", "brave", "new", "world", "!"], " ", "")
+# Join a list of strings with a provided delimeter and last delimeter
+# Some of the used arguments are optional, see the docs 📚️
+# Lists are actually called vectors in Julia. More about this later!
+join(["Apple", "Banana", "Orange", "Lemon"], ", ", " and ")
 
 # ╔═╡ 8d106ad2-5f92-4138-bfff-56ee21e098fa
+# Multi line strings with three double quotes
 multi_line_string = """Line 1
 Line 2
 Line 3"""
 
 # ╔═╡ f8bc4051-93c6-4376-abaa-7b4cb4b8f607
+# To see the new lines (\n)
 println(multi_line_string)
 
 # ╔═╡ b25dc5f2-e186-4da1-b045-47b22c93799b
@@ -224,9 +277,11 @@ b
 a_mult_b = a * b
 
 # ╔═╡ d2607457-1794-4a0f-af41-cb80aadb598f
+# Use $ followed by the name of a variable to insert the variable into a string
 "The result of $a * $b is $a_mult_b"
 
 # ╔═╡ 23dbbe13-d997-4f9f-a300-7cb78c4fb8ee
+# Use brackets after $ to insert a result of computation instead of a variable
 "The result of $a * $b is $(a * b)"
 
 # ╔═╡ e767971a-7e1d-4a78-88d7-03e4ae4d51db
@@ -236,7 +291,7 @@ a_mult_b = a * b
 # ╔═╡ 9e3f698d-e57b-46c2-98e0-157fa7b06ae6
 md"""
 ## Arrays
-An array is a **mutable** **ordered** collection of elements.
+An array is a **mutable ordered** collection of elements of the same type.
 
 Arrays can have one dimension (vector), two dimensions (matrix) or more (tensor).
 """
@@ -662,10 +717,15 @@ uuid = "3f19e933-33d8-53b3-aaab-bd5110c3b7a0"
 # ╠═534f3b32-1fc9-4eed-887a-2cac66c2bdb4
 # ╠═f20de3db-f270-4c43-aab7-692c313b5fa9
 # ╠═c72f187f-9626-45d9-870a-267c8530202c
+# ╠═e4295349-fc5c-48cb-975e-803e44d1a06e
+# ╠═7287122b-e5ea-4f69-963b-023483914992
 # ╠═8b6609b0-5d6d-4c7d-a144-deaff79f93e9
+# ╟─196682db-f5e1-4c07-9d35-644da3eecdd6
 # ╠═10fdb32f-b66f-4c4e-abd9-e856549941b8
 # ╠═00ba151b-a741-448d-b8bf-775217250915
+# ╠═204cf77f-bf37-4110-9c9f-1f9236301ba9
 # ╠═750bba32-e695-48f1-af70-70c94d13366b
+# ╠═0b663bcb-4ff4-4597-b28b-b58c9cbfa181
 # ╟─608d4433-6e68-4f95-8581-437234b58e87
 # ╠═beadbfd3-0015-449a-b6e7-b5182b396c1d
 # ╠═552fafa4-fad5-4efe-895f-255b3ec5c858
@@ -695,7 +755,7 @@ uuid = "3f19e933-33d8-53b3-aaab-bd5110c3b7a0"
 # ╠═d2607457-1794-4a0f-af41-cb80aadb598f
 # ╠═23dbbe13-d997-4f9f-a300-7cb78c4fb8ee
 # ╠═e767971a-7e1d-4a78-88d7-03e4ae4d51db
-# ╠═9e3f698d-e57b-46c2-98e0-157fa7b06ae6
+# ╟─9e3f698d-e57b-46c2-98e0-157fa7b06ae6
 # ╟─d1680205-a8eb-4ef6-ae4f-059e7a30f5c1
 # ╠═b54ace0e-8947-46a3-842a-05b5cbfc4e87
 # ╠═8c47710f-1ed2-40fd-9290-374b498380e3
@@ -715,7 +775,7 @@ uuid = "3f19e933-33d8-53b3-aaab-bd5110c3b7a0"
 # ╠═65d3ddc2-36ed-4126-9211-e838ffc0d859
 # ╠═641e8c05-3e80-47e5-be77-91090a5f799a
 # ╠═2b9a5867-ca82-4a27-a700-bd0bd6c89bbe
-# ╠═87b43f26-7437-4ee9-9b83-5b21e86dd0c9
+# ╟─87b43f26-7437-4ee9-9b83-5b21e86dd0c9
 # ╠═22f5ebc1-fd5c-4ee7-b169-8144fbd9b570
 # ╠═7479c420-2e04-4fe7-823c-3fde9efb54ca
 # ╠═4cd82256-be63-4db1-b2af-82a1358f4881