47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
"use strict"
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// Note: this is mildly perf-sensitive.
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//
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// It does *not* use `delete` - dynamic `delete`s usually cause objects to bail
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// out into dictionary mode and just generally cause a bunch of optimization
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// issues within engines.
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//
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// Ideally, I would've preferred to do this, if it weren't for the optimization
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// issues:
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//
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// ```js
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// const hasOwn = require("./hasOwn")
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// const magic = [
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// "key", "oninit", "oncreate", "onbeforeupdate", "onupdate",
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// "onbeforeremove", "onremove",
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// ]
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// module.exports = (attrs, extras) => {
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// const result = Object.assign(Object.create(null), attrs)
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// for (const key of magic) delete result[key]
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// if (extras != null) for (const key of extras) delete result[key]
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// return result
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// }
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// ```
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var hasOwn = require("./hasOwn")
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var magic = /^(?:key|oninit|oncreate|onbeforeupdate|onupdate|onbeforeremove|onremove)$/
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module.exports = function(attrs, extras) {
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var result = {}
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if (extras != null) {
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for (var key in attrs) {
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if (hasOwn.call(attrs, key) && !magic.test(key) && extras.indexOf(key) < 0) {
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result[key] = attrs[key]
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}
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}
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} else {
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for (var key in attrs) {
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if (hasOwn.call(attrs, key) && !magic.test(key)) {
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result[key] = attrs[key]
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}
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}
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}
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return result
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}
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