TGJ Gilmore TracyGJG
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| /* | |
| Case study | |
| Write a function that, when given an object returns the value of a specific property of that object. | |
| Exercise | |
| Create an object with two numeric properties (x=42 and y=666) and log just the x property to the console. | |
| */ | |
| // Procedural style | |
| { |
TracyGJG
/ moduloNegative.js
Last active
May 3, 2026 21:29
Modulo that handles negative values properly
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| const mod = (v, m) => (v + m) % m; | |
| function modulo(m, v) { | |
| return v == null ? (_v) => mod(_v, m) : mod(v, m); | |
| } | |
| console.log('\nJS mod: -1 % 1000 \t=', -1 % 1000); | |
| console.log('\nmod(-1, 1000) \t\t=', mod(-1, 1000)); |
TracyGJG
/ duplicate-ids.html
Last active
August 3, 2025 16:32
Function to detect and report elements with duplicate Ids
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <title>Duplicate Ids</title> | |
| </head> | |
| <body> | |
| <div id="$m1"> | |
| <p id="p1"></p> |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <title>DOM element ref by ($)id</title> | |
| </head> | |
| <body> | |
| <main>Place holder text</main> |
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| function presentDateTime(dateObjectOrString) { | |
| const pDateTime = (dateObjectOrString instanceof Date) ? dateObjectOrString : new Date(dateObjectOrString); | |
| const pYear = nonZeroSuppression(pDateTime.getFullYear(), 4); | |
| const pMonth = nonZeroSuppression(pDateTime.getMonth() + 1); | |
| const pDay = nonZeroSuppression(pDateTime.getDate()); | |
| const pHours = nonZeroSuppression(pDateTime.getHours()); | |
| const pMinutes = nonZeroSuppression(pDateTime.getMinutes()); | |
| return `${pYear}-${pMonth}-${pDay}, ${pHours}:${pMinutes}`; | |
| function nonZeroSuppression(num, width = 2) { |
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| const tests = [ | |
| [], | |
| [0], | |
| [0, 0], | |
| [0, 1, 2, 3, 5, 1, 2, 5, 8, 5, 1], | |
| [5, 5, 5, 5], | |
| [5, 5, 5, 8], | |
| [5, 5, 8, 8], | |
| [5, 5, 8, 13], | |
| [5, 8, 8, 8], |
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| <script> | |
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