A Boolean holds one of exactly two values: true or false. Booleans are how programs make decisions, is the user signed in? is the answer correct? Comparisons produce them.
EXAMPLE
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YOUR TURN
Your turn → Write three comparisons of your own: one that prints True, one that prints False, and one that checks whether two pieces of text are equal.
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Syntax has to be exact. Every quote, bracket and parenthesis needs its partner, and in Python the spaces at the start of a line count. One slip and the program won't run; the message will say where.
Single values are only the beginning. Programs mostly work with collections: Python lists / JavaScript arrays hold ordered sequences; Python dictionaries / JavaScript objects hold labeled fields. Here's a preview, Level II lives here.
let freedomSingers = ["Rutha", "Bernice", "Cordell"];
let elder = { name: "Fannie Lou Hamer", born: 1917 };
Compare → Nearly identical syntax for sequences. For labeled data, Python quotes its keys; JavaScript usually doesn't. Full mastery comes in Module 8: today you just need to recognize them on sight.
EXAMPLE
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YOUR TURN
Your turn → Positions start at 0, not 1. Print the third singer using her position.
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Syntax has to be exact. Every quote, bracket and parenthesis needs its partner, and in Python the spaces at the start of a line count. One slip and the program won't run; the message will say where.
◈ Graded Challenge
Create four variables that demonstrate four different types: a_number holding 1957, a_text holding the text 1957, a_decimal holding 3.5, and a_flag holding true.
Name it exactly: a_number, a_text, a_decimal, a_flag
4 visible + 1 hidden
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