ACARA Digital Technologies Years 9–10 Definitions Worksheet: Modular and Object-Oriented Programming (JavaScript) (Modules 710–727)
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Key terms
Write what each term means, in your own words.
1
pop(), shift(), splice()
2
includes(value)
3
function total(scores)
4
total += num
5
let largest = nums[0];
6
error message
7
console.log(label, value)
8
breakpoint
9
bug
10
console.assert(condition, message)
Answer Key
ACARA Digital Technologies Years 9–10 · Modules 710–727 · Student wording will vary for definitions
1pop(), shift(), splice() — Array methods that remove items and change the original array: pop removes the last item, shift removes the first, splice(index, count) removes count items starting at index.
2includes(value) — Array method that gives true if the value is in the array, otherwise false. Its partner indexOf(value) gives the position, or -1 if the value is not found.
3function total(scores) — A function with a parameter that receives an array when called, e.g. total([4, 7, 9]). The function can loop over it, return a new array, or change the original array.
4total += num — Adds each array item to a running total inside a loop. Set let total = 0 before the loop, then return total. Divide by nums.length for the average.
5let largest = nums[0]; — Start by treating the first array item as the largest, compare every other item, replace it when a bigger one is found, then return it. Smallest works the same way.
6error message — The console text that names the error type, such as SyntaxError or TypeError, and the line number where it happened, so you know what went wrong and where to look.
7console.log(label, value) — A temporary line that prints a variable's value while the program runs, so you can see where it goes wrong. Add a label to tell values apart, then remove it once fixed.
8breakpoint — A marker on a line in browser DevTools that pauses the program there, so you can step through the code line by line and watch the variables change.
9bug — A mistake in code that gives wrong results. Common ones: a missing return, <= instead of < in an index loop, a total set inside the loop, or calling a function without ().
10console.assert(condition, message) — Prints the message only when the condition is false, so a test like console.assert(add(2, 3) === 5) stays silent when the function gives the expected result.