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JavaScript JavaScript Functions Pass Information Into Functions Function Declarations vs. Function Expressions

Posted by Srishti Gupta
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Srishti Gupta
Full Stack JavaScript Techdegree Student 1,264 Points

Just a doubt regarding function expression

My code just worked without even the semi-colon at the end of the curly bracket. It is not showing an error. Is it okay to write it like the code I have written below?

const getRandomNumber = function(upper) { const randomNumber = Math.floor(Math.random() * upper ) + 1; return randomNumber; } console.log(getRandomNumber(10));

Casey Beaver
Casey Beaver
5,619 Points

i tried to answer your question and deleted it as soon as I realized I didn't understand it myself.

https://stackoverflow.com/questions/1834642/why-should-i-use-a-semicolon-after-every-function-in-javascript

That link may help.

1 Answer

J A
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.a{fill-rule:evenodd;}techdegree
J A
Full Stack JavaScript Techdegree Student 4,646 Points
J A
.a{fill-rule:evenodd;}techdegree
J A
Full Stack JavaScript Techdegree Student 4,646 Points

JavaScript is a little tricky in that you don't always need a semicolon at the end of a line, but it is best practice to put one there, especially if you intend to have multiple statements on one line. In your example you have a function expression and you should use a semicolon at the end, or else there might be some unintended consequences and very subtle bugs.

Casey provided a good StackOverflow link, although the discussion there is a little advanced for a novice programmer. My advice is to always use a semicolon when you create a function expression like you have in your example to avoid potential bugs in your code that are not obvious at the moment.

Side note: remember to use Markdown to format your code for easier reading (click the Markdown Cheatsheet link below the text box). You'll want to use three back-ticks to format a code block like so:

function myFunc = function(param1) {
    alert(`Thanks for giving me ${param1}`);
};

myFunc(123);