Challenge 1 of 12
Double it
Instructions
Write function `double` that returns n * 2.
Editor
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Module 7 of 10
functions
Declare functions, pass arguments, return values, and use defaults.
JavaScript Basics · 0/12 completed · scroll down for every challenge
Challenge 2 of 12 · Add two numbers
Challenge 2 of 12
Add two numbers
Instructions
Write function `add` that returns the sum of `a` and `b`.
Editor
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Challenge 3 of 12 · Default parameter
Challenge 3 of 12
Default parameter
Instructions
Write `greet(name = "friend")` that returns `Hello, ${name}!`.
Editor
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Challenge 4 of 12 · Arrow function
Challenge 4 of 12
Arrow function
Instructions
Create `square` as an arrow function that returns n * n.
Editor
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Challenge 5 of 12 · Even check
Challenge 5 of 12
Even check
Instructions
Write `isEven(n)` that returns true when n is divisible by 2.
Editor
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Challenge 6 of 12 · Max of two
Challenge 6 of 12
Max of two
Instructions
Write `max(a, b)` that returns the larger number.
Editor
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Challenge 7 of 12 · Min of two
Challenge 7 of 12
Min of two
Instructions
Write `min(a, b)` that returns the smaller number.
Editor
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Challenge 8 of 12 · Return early
Challenge 8 of 12
Return early
Instructions
Write `label(n)` — return `"zero"` if n is 0, otherwise return n.
Editor
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Challenge 9 of 12 · Rest parameters
Challenge 9 of 12
Rest parameters
Instructions
Write `sumAll(...nums)` that returns the sum of all arguments.
Editor
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Challenge 10 of 12 · Absolute value
Challenge 10 of 12
Absolute value
Instructions
Write `abs(n)` that returns n if n >= 0, otherwise -n. Do not use Math.abs.
Editor
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Challenge 11 of 12 · Full name helper
Challenge 11 of 12
Full name helper
Instructions
Write `fullName(first, last)` that returns `"first last"`.
Editor
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Challenge 12 of 12 · Is empty string
Challenge 12 of 12
Is empty string
Instructions
Write `isEmpty(text)` that returns true when the string length is 0.
Editor
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