28:null 29:["$","title",null,{"children":"Units | Iris Artin | Observable"}] 2e:T75c,// In the future, I would like to do something more sensible to typeset complex units, but for now this will do function units(u, args) { const { base, prefix, siPrefixes } = { base: null, prefix: 0, siPrefixes: false, ...args }; class QuantityWithUnits extends Number { toString() {} } const fn = function (num, dp = null) { // parseFloat(toFixed) gets rid of trailing zeros const val = dp === null ? num : parseFloat(num.toFixed(dp)); const [int, frac] = val.toString().split("."); function* sp_right(str) { for (let i = 0; i < str.length; i++) { yield str[i]; if ( (str.length - 1 - i) % 3 == 0 && i < str.length - 1 && str[i] != "-" && str[i] != "+" ) { yield "\u00A0"; } } } let str = [...sp_right(int)].join("").replace("-", "—"); if (typeof frac !== "undefined") { str = [str, frac].join(thousands_separator); } let markup = u ? html`${str} ${u}` : html`${str}`; markup.value = num; markup.units = u; return markup; }; if (siPrefixes) { fn.prefix = prefix; fn.prefixed = (p) => base !== null ? base.prefixed(prefix + p) : units(`${si_prefixes[p]}${u}`, { base: fn, prefix: p, siPrefixes: true }); fn.readable = function (value, dp = null) { // Express the value in the best prefix for it const bestPrefix = Math.floor(Math.log(value) / Math.log(1000)) * 3; let bestValue = value / Math.pow(10, bestPrefix); return fn.prefixed(bestPrefix)(bestValue, dp); }; } fn.unit = u; return fn; }2f:[] 2c:{"id":"5f5e05e4ce3a85ad","slug":"units","title":"Units","thumbnail":"22220e08d7e71969c3079345de4e64c88cd6fc07d7babd2f07fb90d3d4d47774","access_level":"public","create_time":"$D2020-02-26T03:50:26.379Z","update_time":"$D2021-11-24T06:52:45.912Z","view_time":null,"first_public_time":"$D2020-02-26T03:50:28.117Z","has_unpublished_edits":null,"fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"f7eb604de06625ed","login":"innermatrix","name":"Iris Artin","avatar_url":"https://avatars-next.observableusercontent.com/781cf1ee03bb64ebe77f2c23cb2cf99cb5477757f4f5e8b778158428d5f71908","tier":"starter_2024"},"version":519,"publish_version":519,"role":null,"authored":false,"authors":[{"type":"individual","id":"eb2c49d0af58d6ef","login":"innermatrix","name":"Iris Artin","avatar_url":"https://avatars-next.observableusercontent.com/781cf1ee03bb64ebe77f2c23cb2cf99cb5477757f4f5e8b778158428d5f71908","tier":null}],"members":[{"type":"individual","id":"eb2c49d0af58d6ef","login":"innermatrix","name":"Iris Artin","avatar_url":"https://avatars-next.observableusercontent.com/781cf1ee03bb64ebe77f2c23cb2cf99cb5477757f4f5e8b778158428d5f71908","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"title":"Units","cells":[{"id":0,"value":"md`# Units\n\nBecause I can't be bothered to keep remembering the right way to typeset quantities with units, with the correct spacing and punctuation.\n\nThis follows the SI/ISO rules of using non-breaking spaces for thousands separator (to avoid confusion), as well as using a non-breaking space to separate the number from the unit abbreviation. The decimal separator is \".\" by default. \n\nThere is no magic unit arithmetic here; these are meant for display purposes, and trying to use these in calculations will just make things annoying for you.\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":299,"value":"md`\nFor units I already thought of:\n\n~~~js\nimport { Ω } from \"@airbornemint/units\"\n~~~\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":72,"value":"Ω(-1234567890.0987654321)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":228,"value":"ºC(-273.15)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":407,"value":"You can also format prefixed units by passing in the power-of-10 multiplier:","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":410,"value":"Ω.prefixed(-6)(123.45)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":301,"value":"md`\nIf you need to make your own:\n\n~~~js\nimport { units } from \"@airbornemint/units\"\n~~~\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":87,"value":"Re = units(\"°Ré\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":88,"value":"Re(5.1234)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":309,"value":"md`If you just want to format a number as if it was a quantity with units, but leave the units out (for example, if you have a table of measurements and the column title specifies the units for all the entries in the column):`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":311,"value":"n(1234.56)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":323,"value":"md`If you'd like to round your value at a certain number of decimal places:`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":326,"value":"Ω(-1234567890.0987654321, 3)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":298,"value":"md`\nYou can override the decimal separator using:\n\n~~~js\nthousands_separator = \",\"\n~~~\n\nfollowed by \n\n~~~js\nimport { units } with { thousands_separator as thousands_separator } from \"@airbornemint/units\"\n~~~\n\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":77,"value":"html`

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}).prefixed(3)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":141,"value":"A = units(\"A\", { siPrefixes: true })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":144,"value":"K = units(\"K\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":147,"value":"mol = units(\"mol\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":150,"value":"cd = units(\"cd\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":157,"value":"md`### Named derived units`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":160,"value":"rad = units(\"rad\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":163,"value":"sr = units(\"sr\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":165,"value":"Hz = units(\"Hz\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":168,"value":"N = units(\"N\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":171,"value":"Pa = units(\"Pa\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":175,"value":"J = units(\"J\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":178,"value":"W = units(\"W\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":183,"value":"C = units(\"C\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":185,"value":"V = units(\"V\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":189,"value":"F = units(\"F\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":56,"value":"Ω = units(\"Ω\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":190,"value":"S = units(\"S\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":196,"value":"Wb = units(\"Wb\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":199,"value":"T = units(\"T\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":202,"value":"H = units(\"H\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":205,"value":"ºC = units(\"ºC\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":208,"value":"lm = units(\"lm\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":210,"value":"lx = units(\"lx\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":214,"value":"Bq = units(\"Bq\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":215,"value":"Gy = units(\"Gy\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":220,"value":"Sv = units(\"Sv\", {siPrefixes: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":223,"value":"kat = units(\"kat\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":235,"value":"md`## Imperial units`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":282,"value":"html`But, like, only the reasonable ones`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":238,"value":"inch = units('in') // Sadly, none of \"in\", ”, or \" are valid names in JS","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":245,"value":"ft = units(\"ft\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":251,"value":"yd = units(\"yd\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":254,"value":"mi = units(\"mi\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":257,"value":"nm = units(\"nm\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":260,"value":"floz = units(\"fl 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units(\"lb\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":278,"value":"t = units(\"t\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":126,"value":"md`## Misc other units`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":97,"value":"pct = units(\"%\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":307,"value":"n = units(null)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":230,"value":"md`## Define your own units`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":6,"value":"$2e","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":394,"value":"si_prefixes = Object.fromEntries(\n [\n \"Y\",\n \"Z\",\n \"E\",\n \"P\",\n \"T\",\n \"G\",\n \"M\",\n \"k\",\n \"\",\n \"m\",\n \"µ\",\n \"n\",\n \"p\",\n \"f\",\n \"a\",\n \"z\",\n \"y\"\n ].map((prefix, idx, prefixes) => [\n ((prefixes.length - 1) / 2 - idx) * 3,\n prefix\n ])\n)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":457,"value":"function si_prefix_for_abbreviation(unit, abbrev) {\n const [prefix] = Object.entries(si_prefixes).find(\n ([prefix, abbreviation]) => `${abbreviation}${unit.unit}` == abbrev\n );\n return parseInt(prefix);\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":289,"value":"thousands_separator = \".\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W2f","stdlib":"1","titling":"auto"}} 2d:"$2c:body"