ACARA Digital Technologies Years 7–8 Word Scramble: Programming with Control Structures and Functions (JavaScript) (Modules 624–634)
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Word scramble
Unscramble the letters and write each key term on the line.
1
OFERNERRREREEC
An error shown when code uses a variable or function name that has not been declared, often from a typo, wrong capital letter, wrong scope or using it before declaring it.
2
GOCIL RORER
A mistake that lets the program run with no error message but gives a wrong result, such as using > instead of >=, the wrong operator, or steps in the wrong order.
3
FOY-BN-FOE RORRE
A loop bug where it runs one pass too many or too few, caused by a wrong start value or mixing up < and <=. For example, i starting at 0 with i <= 5 runs 6 times, not 5.
4
LESOCOA.OGL("ONLTT:", OALTT)
Prints a labelled variable value while the program runs, so you can spot the line where the value first goes wrong. Remove these debug lines once the bug is fixed.
5
AECRT LBEAT
A table with one row per loop repeat, showing the counter, other variables and any output, filled in by hand until the condition is false.
6
// OCLOSOL.NGO(TALTE);
Putting // in front of a line makes JavaScript skip it, so you can switch code off to find a bug. Remove the // to switch it back on.
7
EPCDRIT, NHEGCA, URN
Read the code and predict what it does, change one small part (a value, condition or message), run it, then compare the result with your prediction.
8
IGUEGGDNB
Finding and fixing bugs: run the program, read the error or compare wrong output with what you expected, find the faulty line, fix one thing, then rerun to retest.
Answer Key
ACARA Digital Technologies Years 7–8 · Modules 624–634
1OFERNERRREREEC → ReferenceError — An error shown when code uses a variable or function name that has not been declared, often from a typo, wrong capital letter, wrong scope or using it before declaring it.
2GOCIL RORER → logic error — A mistake that lets the program run with no error message but gives a wrong result, such as using > instead of >=, the wrong operator, or steps in the wrong order.
3FOY-BN-FOE RORRE → off-by-one error — A loop bug where it runs one pass too many or too few, caused by a wrong start value or mixing up < and <=. For example, i starting at 0 with i <= 5 runs 6 times, not 5.
4LESOCOA.OGL("ONLTT:", OALTT) → console.log("total:", total) — Prints a labelled variable value while the program runs, so you can spot the line where the value first goes wrong. Remove these debug lines once the bug is fixed.
5AECRT LBEAT → trace table — A table with one row per loop repeat, showing the counter, other variables and any output, filled in by hand until the condition is false.
6// OCLOSOL.NGO(TALTE); → // console.log(total); — Putting // in front of a line makes JavaScript skip it, so you can switch code off to find a bug. Remove the // to switch it back on.
7EPCDRIT, NHEGCA, URN → predict, change, run — Read the code and predict what it does, change one small part (a value, condition or message), run it, then compare the result with your prediction.
8IGUEGGDNB → debugging — Finding and fixing bugs: run the program, read the error or compare wrong output with what you expected, find the faulty line, fix one thing, then rerun to retest.