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calculator

Build a Calculator App in HTML, CSS & JavaScript 2022 by Tyler Potts

Tyler's video caught my eye as a quick fun exercise to try out a few things, but I ended up spending quite a bit of time on it and taking things a bit further.

Amongst other things, I did some restyling and refined the input/output formatting.
I went down the rabbit hole hammering out input validation and refining other parts of the logic. There were some tricky problems like how to support negative numbers without adding a +/- key, and catching edge cases like infinity and numbers expressed with exponential notation.

JavaScript can do a pretty bad job of evaluating some expressions.
e.g.

  • .3 x 10 = 3
  • .3 ÷ .1 = 2.9999999999999996


credits

YouTube video: Build a Calculator App in HTML, CSS & JavaScript 2022 by Tyler Potts

Background art by Dan Cristian Pădureț

Calculator favicon from icons8.com

YouTube icon from iconfinder.com

Applause icon from icons8.com

GitHub icon from iconfinder.com

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