| // 16-21 April 2022 | |
| // prototype pollution in JavaScript - sources, detection, defenses | |
| // [ draft in progress... ] | |
| // Every object has this property: __proto__. | |
| // The __proto__ property has been deprecated officially since 2015 but is still supported everywhere. | |
| // The __proto__ property points to the object's constructor's prototype property. | |
| // Every prototype is a property of a constructor function | |
| // For example, `"a string".constructor.prototype` is `String.prototype` which inherits from `Object.prototype` and contains a few of its own properties. |
I found a rounding bug in Number.toFixed() in every JavaScript environment I've tried (Chrome, Firefox, Internet Explorer, Brave, and Node.js). The fix is surprisingly simple. Read on…
I found this version of the rounding bug in toFixed() while revising a number-formatting function that performs the same kind of thing as Intl.NumberFormat#format().
(1.015).toFixed(2) // => returns "1.01" instead of "1.02"
Before we get started…
Prefer script-src-elem over script-src for better cross-browser support of this solution.
I have a variation on this solution using embedded workers with blob URLs at https://gist.github.com/dfkaye/14e5cc5dbe5bb38a9d80f25f54061c7f.
| function getFnName(fn) { | |
| fn = Object(fn) | |
| var F = typeof fn == 'function' | |
| var N = fn.name | |
| var S = F && ((N && ['', N]) || fn.toString().match(/function ([^\(]+)/)) | |
| return (!F && 'not a function') || (S && S[1] || 'anonymous'); | |
| } | |
| console.log(getFnName(String)); // 'String' | |
| console.log(getFnName(function test(){})); // 'test' |
| // 5 March 2022 | |
| // Using window.crypto.subtle.digest() | |
| // @param "sha-256" or other algorithm | |
| // @param DataView with ArrayBuffer or just ArrayBuffer | |
| // Not my own. | |
| // Copy+paste+modified from | |
| // https://stackoverflow.com/a/68545495 |
| // 5 Aug 2024 | |
| // multiple inheritance | |
| // "inspired" by tweet, 1 August 2024, from Colin McDonnell (and goaded by some | |
| // benighted replies) at https://x.com/colinhacks/status/1819138095104905689 | |
| // Challenge: Implement merge() to handle multiple inheritance, as per example: | |
| // ``` | |
| // class A {...} | |
| // class B {...} |
| // 15 July 2024 | |
| // simulate chunked HTML response stream in the browser | |
| // 1. create the response stream parts | |
| var encoder = new TextEncoder; | |
| var text = ` | |
| <html lang="en"> |
| // 1 July 2024 | |
| // parseBigInt | |
| function parseBigInt(b, r) { | |
| var n = String(b).split("n")[0]; | |
| return parseInt(n, r); | |
| } | |
| var base10 = ["2n.3", "5.5", "FFnA", "n.3"].map(function (v, i) { | |
| return parseBigInt(v, 8); |
| // 22 June 2024 | |
| // is-number with bigint support | |
| function isNumber(n) { | |
| var m = typeof n == 'bigint' | |
| ? 0n | |
| : 0; | |
| return n - m === Object(n).valueOf(); | |
| } |
| // 12 June 2024 | |
| // realizing the algorithm for processing event timestamps in Fidge (1988), | |
| // "Timestamps in Message-Passing Systems That Preserve the Partial Ordering" | |
| // https://fileadmin.cs.lth.se/cs/Personal/Amr_Ergawy/dist-algos-papers/4.pdf | |
| // missing the query or aggregation step that collects the timestamps and sorts | |
| // them by determinate vs. non-determinate ordering. | |
| // determinate ordering should be singular (i.e., only one permutation) whereas |