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Episode 2 of 16 · Web development, end to end

JavaScript basics: values, scope, and the parts that surprise people

Chapters

1. The copy that wasn't0:00
2. Seven, and all frozen0:16
3. What the label holds0:34
4. Typeof, and its lie0:51
5. Two kinds of nothing1:09
6. Copying, properly1:28
7. A function keeps its room1:47
8. Global, function, block2:03
9. Lookup goes outward2:21
10. Hoisting and the dead zone2:37
11. A function plus its birthplace2:56
12. The loop that prints three threes3:12
13. The call decides, not the code3:28
14. Default and implicit3:45
15. The this you dropped4:03
16. Call, apply, and bind4:20
17. New makes the object4:39
18. Arrows opt out4:58
19. The question gets forwarded5:14
20. Where the link comes from5:32
21. Two things called prototype5:51
22. One copy, shared6:10
23. Class is sugar6:29
24. Where the sugar stops6:49
25. Two questions7:09
26. Strict equality, and its two oddities7:26
27. What double equals actually does7:46
28. The famous ones, decoded8:04
29. Plus is the odd one8:22
30. Eight falsy values8:42
31. A file that declares itself9:01
32. Named, default, and live9:18
33. Const by default9:36
34. Pulling values out9:55
35. Three dots, two jobs10:12
36. Optional chaining, and zero10:31
37. The whole thing10:51

JavaScript basics: values, scope, and the parts that surprise people. Think of a variable as a label, not a box. Copy a number into a second label and change it, and the first is untouched. Copy an object and change it, and the first changed too. Sam

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