FAQ: Functions - Concise Body Arrow Functions


This community-built FAQ covers the "Concise Body Arrow Functions " exercise from the lesson “Functions”.

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This exercise can be found in the following Codecademy content:

Web Development

Introduction To JavaScript

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A post was split to a new topic: I don’t get this lesson


Even more concise code:

const plantNeedsWater = day => day === ‘Wednesday’;



And we can write it this consisely, why?


The solution to this exercise confused me a tad…

How are we able to use the concise body function when the correct answer is too long and still results in a multi-line block?


When there are multiple lines of code in the block, write it like a regular function expression (with curly braces and a return).

const foo = (baz, bar) => {
    // code
    // code
    // code
    return "some value"


I struggled with this exercise too.
Whilst concise functions sound useful - I prefer the more readable form of multi-line functions personally.
Still it’s useful to know!


I was good until the last page (review functions):

When I played around with the code I noticed:

const plantNeedsWater = day => day === 'Wednesday' ? 'Water me' : "Don't water me";

can also be on two lines

const plantNeedsWater = day => day === 'Wednesday' 
? 'Water me' : "Don't water me";

… without having to use the ‘return’ statement, or additional code. I was considering this if the true/false answers were a longer statement; to allow for better readability. Is this doable, or should I be considering a better way to keep the code ‘clean’?