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Scoping problem with functions (and mathematical equations)

in Getting Started • 9 years ago

I just don't understand scoping. I've read a lot of posts about it and still don't get even the gist of it. I've studied http://stackoverflow.com/questions/500431/javascript-variable-scope but don't understand the examples. I should read a book about it, but for now I'm stuck at work and need to get these functions sorted.

I've made a jsfiddle of my project: http://jsfiddle.net/JSDesign/xceBx/

It's a mortgage refinance calculator with break even point, snapshot savings, and lifetime savings. I get the results from the first function just fine (Break Even), but the other two aren't firing as far as I can tell.

I'm not getting any console errors.

I put a comment in the script where I think I'm going wrong, but not understanding scope properly there could be multiple issues.

Thank you very much for any help!

Replies(2)

kbwood.au

Re: Scoping problem with functions (and mathematical equations)

9 years ago

Variables defined with var are local to the function in which they appear and can be seen by any contained functions. You need to move the calculate_lifetime_savings and calculate_snapshot_savings functions inside calculate_break_even_period. You should pass the result of these inner functions back as return values to the containing function/scope. You were also missing a val() call on one of the input values. The outcome is something like this.

Jeannie

Re: Re: Scoping problem with functions (and mathematical equations)

9 years ago

Thank you - your explanation makes things much clearer.

Also thanks for the code cleanup!

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