Number vs Numbers as variable?

Language Help JavaScript
25

Im confused as to why my answer doesnt mark off as green despite getting the correct answer in the console.

//Create the smallNumbers array below const smallNumbers = bigNumbers.map(bigNumbers => { return bigNumbers / 10; })

the codecadamy official answer is

const smallNumbers = bigNumbers.map(num => num/100); console.log(smallNumbers);

but we never even declared someting called num???

26

Using the same name for your function parameter is a bad idea/practice

num is a parameter, parameters are defined along with the function. the .map method will then call your function and provide arguments/values for your parameters

1 Like
27

Hi everyone,
I misread the use of iterators and I thought that the parameter had to be identical to the name of the array (since I understood that it should not be the case). But I did some little experiments on my side and got the following results that I canā€™t figure out:

const helloWorld = "Hello"; const startDiscussion = (helloWorld) => { helloWorld = helloWorld + ". I'm fine"; console.log(helloWorld); } startDiscussion("Yes"); console.log(helloWorld);

When I run the code I donā€™t get any errors, how is this possible? Yet helloWorld is a const global variable, I shouldnā€™t be able to reassign it in the function.
And then why when I print helloWorld, is it its old name?
Iā€™m maybe just too curious. Thanks all.

28

I had the same question. The names seem like a good choice for someone experienced. Iā€™d rather have named it numbersAsArray vs numberAsArgument or something. For total beginners even small stuff like this can start making us feel like weā€™re in Math class in 1995 where things are implied and you give up learning because you can never seem to keep up with everything implied.