JavaScript Definitions Worksheet: Arrays & Strings (Modules 21–30)
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Key terms
Write what each term means, in your own words.
1
break
2
[]
3
for...of
4
push()
5
forEach()
6
map()
7
filter()
8
reduce()
9
length
10
toUpperCase()
Answer Key
JavaScript · Modules 21–30 · Student wording will vary for definitions
1break — Exits a loop completely, stopping it before it finishes all its passes.
2[] — Creates an array and, when placed after a variable name, accesses an element by its index.
3for...of — Loops directly over each value in an array, without needing an index.
4push() — Adds one or more elements to the end of an array, changing the original array.
5forEach() — Calls a given function once for every element in an array.
6map() — Creates a new array by running a given function on every element of the original array.
7filter() — Creates a new array containing only the elements that pass a test provided by a function.
8reduce() — Combines every element of an array into a single value using an accumulator function.
9length — The number of characters in a string, accessed as a property without parentheses.
10toUpperCase() — Returns a new string with all letters converted to uppercase.