Consolidate calculator logic

[agrahamg]

Moved common logic from pattern generators into util file to remove some of the boilerplate code.

[myogpatterns]

Hi @agrahamg,
Thank you for contributing to the site! Very gracious of you to spend time consolidating the redundancies across multiple pages by adding utility functions. Also thanks for clarifying many of my overly cryptic variable names and fixing the input labels. As you may be able to tell, I'm a novice but noticed you aren't using line ending with semicolons. I actually didn't know ASI was a thing - had to look it up. While I see your code works, the mixed use may trip me and others up in the future. Would you mind adding the line endings just to keep the syntax consistent?

[agrahamg]

I can certainly add semicolons in. If there are any other parts that are confusing or seem odd I can try to clarify them as well.

You might be a novice at javascript but you seem to know a thing or two about sewing. I think the idea behind the site is great and hope you can continue making patterns.

[myogpatterns]

Thank you for adding the line endings. I found a functional issue in getNumberFromField using parseInt. Added a comment.

Also a small readability thing for the roll top page, commented. The roll top page was the latest generator and pulled the seam allowance based on units radio selection. Earlier pattern generators had the text in html. My thought for future was to allow people to set a seam allowance, but suspected it would lead to confusion so I had not updated older pages.

[myogpatterns]

Thanks again @agrahamg !

[myogpatterns]

@agrahamg If you're interested in making one of my premium patterns, hit me up via dm or email and I'll shoot you a complimentary download credit.