Codes for chapters 1, 2, and 3

ch01.jl

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+# Bogumił Kamiński, 2021
+
+# Codes for chapter 1
+
+# Code from section 1.2.1
+
+function f(n)
+    s = 0
+    for i in 1:n
+        s += i
+    end
+    return s
+end
+
+@time f(1_000_000_000)
+
+# Code allowing to reproduce the data frame presented in section 1.3
+
+using DataFrames
+
+DataFrame(a=1:3, name=["Alice", "Bob", "Clyde"],
+          age=[19, 24, 21], friends=[[2], [1, 3], [2]],
+          location=[(city="Atlanta", state="GA"),
+                    (city="Boston", state="MA"),
+                    (city="Austin", state="TX")])