andyogo / babel-plugin-math Goto Github PK

Transform any Math.max(...) to a ternary conditional expression x > y ? x : y.

Todo:

• any number of arguments shall work, i.e.:

  Math.max(1, 2, 3);
  // ->
  (foo = 1 > 2 ? 1 : 2) > 3 ? foo : 3

• dot Math.max() and bracket Math['max']() notation should be transformed - https://github.com/babel/babylon/blob/master/ast/spec.md#memberexpression
• dynamic apply Math.max.apply(Math, [5,20,50,35]) and call Math.max.call(Math, 5,20,50,35)

  var arr = [5,20,50,35];
  for(var i=1, l=arr.length, max=arr[0]; i<l; i++) {
    if(arr[i]>max) {
      max=arr[i]
    }
  }

  http://jsben.ch/srGJl
• ES6 ... spread array Math.max(...args)
• cached const { max } = Math, const max = Math.max, etc. should be transformed too (and the cached variable could be removed)
• derived arguments, like function calls, binary and logical operations shall work
• derived arguments be computed only once

Test Page:
https://astexplorer.net/#/gist/a094859432a2424927d0551f4d037ef8/2dc2ca279a17e3e20beb31627e789f97cc8602af

https://github.com/semantic-release/semantic-release

https://github.com/jaebradley/semantic-release-example

https://stackoverflow.com/questions/8885323/speed-of-the-math-object-in-javascript

https://stackoverflow.com/questions/2526682/why-is-javascripts-math-floor-the-slowest-way-to-calculate-floor-in-javascript/2527468#2527468