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Title: [compiler] Conditional expressions probably need to return `undefined` by default · Issue #45 · lightscript/lightscript · GitHub

Open Graph Title: [compiler] Conditional expressions probably need to return `undefined` by default · Issue #45 · lightscript/lightscript

X Title: [compiler] Conditional expressions probably need to return `undefined` by default · Issue #45 · lightscript/lightscript

Description: Problem x = if false: 1 // x === null y = (-> if false: 1 )() // y === undefined Wrapping an expression in a function had better not change its value. Proposed Solution While trying to work around JavaScript's proliferation of distinct-y...

Open Graph Description: Problem x = if false: 1 // x === null y = (-> if false: 1 )() // y === undefined Wrapping an expression in a function had better not change its value. Proposed Solution While trying to work around ...

X Description: Problem x = if false: 1 // x === null y = (-> if false: 1 )() // y === undefined Wrapping an expression in a function had better not change its value. Proposed Solution While trying to work arou...

Opengraph URL: https://github.com/lightscript/lightscript/issues/45

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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[compiler] Conditional expressions probably need to return `undefined` by default","articleBody":"## Problem\r\n```js\r\nx = if false: 1\r\n// x === null\r\n\r\ny = (-\u003e\r\n  if false:\r\n    1\r\n)()\r\n// y === undefined\r\n```\r\n\r\nWrapping an expression in a function had better not change its value.\r\n\r\n## Proposed Solution\r\n\r\nWhile trying to work around JavaScript's proliferation of distinct-yet-falsy values may be noble in spirit, the fact that JavaScript returns `undefined` by default basically forces LSC to do the same for consistency's sake. I think unprovided branches of conditional expressions (`if`, and possibly `match` if it doesn't throw-on-else) should be returning `undefined` to match up with JavaScript core function behavior.\r\n","author":{"url":"https://github.com/wcjohnson","@type":"Person","name":"wcjohnson"},"datePublished":"2017-09-05T21:48:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/45/lightscript/issues/45"}

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