constructor() for creating Web Audio Oscillators? – Khan Academy Help Center

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Tachie my darling miss

July 03, 2022 20:33
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So I have a function that can get a value through Function.

function $(e) { return sq.constructor('return ' + e)(); }
var context = $('new (window.webkitAudioContext || window.AudioContext)');

I'm using this to create oscillator sounds in the PJS environment. Is this allowed?

https://khanacademy.org/cs/i/5573412618027008

Squishy's Piano Roll used eval, but this uses Function which is considered safer according to the documentation:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval#never_use_eval!

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2 comments

HSstudent16

July 13, 2022 17:04
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I'm pretty sure using the Web Audio API is only allowed for HTML programs on Khan Academy. The guidelines under PJS programs state that...

"Programs should only create sounds using the `playSound/getSound` functions, with the sounds listed in the soundpicker."

The HTML guidelines, however, say...

"Webpages should only create sounds using the files available to ProcessingJS programs or the Web Audio API oscillator"
Tachie my darling miss

July 13, 2022 17:28
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Thanks for the reply!

I've moved the game over to HTML anyways :D

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