My version of the ultimate whatever-to-number conversion table, heavily inspired by https://stackoverflow.com/a/17106702
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February 27, 2023 14:27
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <title>JS conversion to number</title> | |
| <style> | |
| table { | |
| border-collapse: collapse; | |
| } | |
| tr:nth-child(odd) { | |
| background: #fafafa; | |
| } | |
| th { | |
| text-align: left; | |
| font-family: monospace; | |
| font-weight: 900; | |
| font-size: 14px; | |
| } | |
| td { | |
| border: 1px solid #e0e0e0; | |
| padding: 5px; | |
| font: 12px monospace; | |
| } | |
| td:not(:first-child) { | |
| text-align: right; | |
| } | |
| thead td { | |
| background: #3663ae; | |
| color: white; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="main.ts" type="module"></script> | |
| </body> | |
| </html> |
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| const EXPRESSION_ARRAY = [ | |
| ['parseInt(x)', (x) => parseInt(x), 40], | |
| ['parseFloat(x)', (x) => parseFloat(x), 5], | |
| ['Number(x)', (x) => Number(x), 13], | |
| ['+x', (x) => +x, 2], | |
| ['~~x', (x) => ~~x, 0], | |
| ['x >>> 0', (x) => x >>> 0, 0], | |
| ['isNaN(x)', (x) => isNaN(x), 3], | |
| ['Number.isNaN(x)', (x) => Number.isNaN(x), 0], | |
| ] as const | |
| const VALUE_ARRAY = [ | |
| ['"123"', '123'], | |
| ['"+123"', '+123'], | |
| ['"-123"', '-123'], | |
| ['"123.45"', '123.45'], | |
| ['"-123.45"', '-123.45'], | |
| ['"12e5"', '12e5'], | |
| ['"12e-5"', '12e-5'], | |
| [], | |
| ['"0123"', '0123'], | |
| ['"0000123"', '0000123'], | |
| ['"0b111"', '0b111'], | |
| ['"0o10"', '0o10'], | |
| ['"0xBABE"', '0xBABE'], | |
| [], | |
| ['"4294967295"', '4294967295'], | |
| ['"123456789012345678"', '123456789012345678'], | |
| ['"12e999"', '12e999'], | |
| [], | |
| ['""', ''], | |
| ['"123foo"', '123foo'], | |
| ['"123.45foo"', '123.45foo'], | |
| ['" 123 "', ' 123 '], | |
| ['"foo"', 'foo'], | |
| ['"12e"', '12e'], | |
| ['"0b567"', '0b567'], | |
| ['"0o999"', '0o999'], | |
| ['"0xFUZZ"', '0xFUZZ'], | |
| [], | |
| ['"+0"', '+0'], | |
| ['"-0"', '-0'], | |
| ['"Infinity"', 'Infinity'], | |
| ['"+Infinity"', '+Infinity'], | |
| ['"-Infinity"', '-Infinity'], | |
| ['BigInt(1)', BigInt(1)], | |
| [], | |
| ['null', null], | |
| ['undefined', undefined], | |
| ['true', true], | |
| ['false', false], | |
| ['Infinity', Infinity], | |
| ['NaN', NaN], | |
| [], | |
| ['{}', {}], | |
| [ | |
| '{valueOf: function f(){return 42}}', | |
| { | |
| valueOf: function f() { | |
| return 42 | |
| }, | |
| }, | |
| ], | |
| [ | |
| '{toString: function f(){return "56"}}', | |
| { | |
| toString: function f() { | |
| return '56' | |
| }, | |
| }, | |
| ], | |
| ] as const | |
| document.body.appendChild( | |
| h('table', {}, [ | |
| h('tr', {}, [ | |
| h('th', { textContent: 'Method stats ->' }), | |
| ...EXPRESSION_ARRAY.map(([_exp, _call, value]) => | |
| h('th', {}, [h('input', { value })]) | |
| ), | |
| ]), | |
| h('tr', {}, [ | |
| h('th', { textContent: 'Value v' }), | |
| ...EXPRESSION_ARRAY.map(([expression]) => | |
| h('th', { textContent: expression }, []) | |
| ), | |
| ]), | |
| ...VALUE_ARRAY.map(([text, value]) => | |
| text === undefined | |
| ? h('tr', {}, [h('td')]) | |
| : h('tr', {}, [ | |
| h('th', { textContent: text }), | |
| ...EXPRESSION_ARRAY.map(([_expression, callback]) => | |
| h('td', {}, [evaluate(value, callback)]) | |
| ), | |
| ]) | |
| ), | |
| ]) | |
| ) | |
| function evaluate(input, callback: (s) => any) { | |
| let result | |
| let output | |
| try { | |
| result = callback(input) | |
| output = h('span', { textContent: result }) | |
| } catch (e) { | |
| output = h('span', { textContent: 'Error' }) | |
| result = NaN | |
| } | |
| if (result === true) { | |
| output.style.fontWeight = 900 | |
| output.style.color = '#007700' | |
| } | |
| if (Object.is(result, NaN)) { | |
| output.style.color = 'red' | |
| } | |
| return output | |
| } | |
| function h( | |
| name, | |
| props: { textContent?: string; value?: string | number } = {}, | |
| children: HTMLElement[] = [] | |
| ) { | |
| const element = document.createElement(name) | |
| element.textContent = props.textContent | |
| element.value = props.value | |
| children.forEach((child) => { | |
| element.appendChild(child) | |
| }) | |
| return element | |
| } |
| Value v \ Method > | parseInt(x) | parseFloat(x) | Number(x) | +x | ~~x | x >>> 0 | isNaN(x) | Number.isNaN(x) |
|---|---|---|---|---|---|---|---|---|
| "123" | 123 | 123 | 123 | 123 | 123 | 123 | false | false |
| "+123" | 123 | 123 | 123 | 123 | 123 | 123 | false | false |
| "-123" | -123 | -123 | -123 | -123 | -123 | 4294967173 | false | false |
| "123.45" | 123 | 123.45 | 123.45 | 123.45 | 123 | 123 | false | false |
| "-123.45" | -123 | -123.45 | -123.45 | -123.45 | -123 | 4294967173 | false | false |
| "12e5" | 12 | 1200000 | 1200000 | 1200000 | 1200000 | 1200000 | false | false |
| "12e-5" | 12 | 0.00012 | 0.00012 | 0.00012 | 0 | 0 | false | false |
| "0123" | 123 | 123 | 123 | 123 | 123 | 123 | false | false |
| "0000123" | 123 | 123 | 123 | 123 | 123 | 123 | false | false |
| "0b111" | 0 | 0 | 7 | 7 | 7 | 7 | false | false |
| "0o10" | 0 | 0 | 8 | 8 | 8 | 8 | false | false |
| "0xBABE" | 47806 | 0 | 47806 | 47806 | 47806 | 47806 | false | false |
| "4294967295" | 4294967295 | 4294967295 | 4294967295 | 4294967295 | -1 | 4294967295 | false | false |
| "123456789012345678" | 123456789012345680 | 123456789012345680 | 123456789012345680 | 123456789012345680 | -1506741424 | 2788225872 | false | false |
| "12e999" | 12 | Infinity | Infinity | Infinity | 0 | 0 | false | false |
| "" | NaN | NaN | 0 | 0 | 0 | 0 | false | false |
| "123foo" | 123 | 123 | NaN | NaN | 0 | 0 | true | false |
| "123.45foo" | 123 | 123.45 | NaN | NaN | 0 | 0 | true | false |
| " 123 " | 123 | 123 | 123 | 123 | 123 | 123 | false | false |
| "foo" | NaN | NaN | NaN | NaN | 0 | 0 | true | false |
| "12e" | 12 | 12 | NaN | NaN | 0 | 0 | true | false |
| "0b567" | 0 | 0 | NaN | NaN | 0 | 0 | true | false |
| "0o999" | 0 | 0 | NaN | NaN | 0 | 0 | true | false |
| "0xFUZZ" | 15 | 0 | NaN | NaN | 0 | 0 | true | false |
| "+0" | 0 | 0 | 0 | 0 | 0 | 0 | false | false |
| "-0" | 0 | 0 | 0 | 0 | 0 | 0 | false | false |
| "Infinity" | NaN | Infinity | Infinity | Infinity | 0 | 0 | false | false |
| "+Infinity" | NaN | Infinity | Infinity | Infinity | 0 | 0 | false | false |
| "-Infinity" | NaN | -Infinity | -Infinity | -Infinity | 0 | 0 | false | false |
| BigInt(1) | 1 | 1 | 1 | Error | 1 | Error | Error | false |
| null | NaN | NaN | 0 | 0 | 0 | 0 | false | false |
| undefined | NaN | NaN | NaN | NaN | 0 | 0 | true | false |
| true | NaN | NaN | 1 | 1 | 1 | 1 | false | false |
| false | NaN | NaN | 0 | 0 | 0 | 0 | false | false |
| Infinity | NaN | Infinity | Infinity | Infinity | 0 | 0 | false | false |
| NaN | NaN | NaN | NaN | NaN | 0 | 0 | true | true |
| {} | NaN | NaN | NaN | NaN | 0 | 0 | true | false |
| {valueOf: function f(){return 42}} | NaN | NaN | 42 | 42 | 42 | 42 | false | false |
| {toString: function f(){return "56"}} | 56 | 56 | 56 | 56 | 56 | 56 | false | false |
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