ACARA Digital Technologies Years 7–8 Definitions Worksheet: Programming with Control Structures and Functions (JavaScript) (Modules 562–580)
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Key terms
Write what each term means, in your own words.
1
sequence
2
console.log("Hi");
3
score = score + 1;
4
const
5
number
6
boolean
7
(a + b) / 2
8
total += price
9
prompt("question")
10
console.log, prompt, let
Answer Key
ACARA Digital Technologies Years 7–8 · Modules 562–580 · Student wording will vary for definitions
1sequence — Statements run one after another from top to bottom, so changing the order of lines can change the result. A variable must be set before it is used.
2console.log("Hi"); — JavaScript is case-sensitive, so console.log must be typed exactly. Every opening quote, bracket or brace needs a matching closing one, like the quotes and ( ) here.
3score = score + 1; — Reassigns an existing let variable. The right side is worked out first using the old value, then the new value replaces it. Don't write let again.
4const — Declares a variable whose value is set once and cannot be reassigned. Use it for fixed values like a maximum score. Changing it later causes a TypeError.
5number — A value written without quotes, whole (7), decimal (3.5) or negative (-2), that you can calculate with. 5 is a number but '5' in quotes is a string, which is text.
6boolean — A data type with only two values, true or false, written in lowercase with no quotes. Comparisons like 5 > 3 give a boolean, and true is not the same as the string "true".
7(a + b) / 2 — Brackets run first, so a + b is added before dividing by 2. Then * and /, then + and -. Operators on the same level go left to right. Without brackets, only b is divided by 2.
8total += price — A shorthand update. Operators like +=, -=, ++ and -- change a variable using its own value, so total += price means total = total + price. count++ adds 1 and count-- takes away 1.
9prompt("question") — Shows a message box, waits for the user to type, then returns what they typed as a string. Store it in a variable. Cancel returns null.
10console.log, prompt, let — Blocks have typed JavaScript equivalents: a say block becomes console.log, an ask block becomes prompt, and a set variable block becomes let (or an assignment with =).