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blank-object
Advanced tools
Object.create(null) turns out to be quite slow to alloc in v8, but instead if
we inherit from an ancestory with proto = create(null)
we have nearly
the same functionallity but with dramatically faster alloc.
var BlankObject = require('blank-object');
var bo = new BlankObject();
This is designed for a presence check map[key] !== undefined
since in
is also slow like hasOwnProperty
, delete
and Object.create
.
function UNDEFINED() {}
export default class Map {
constructor() {
this.store = new BlankObject();
}
has(key) {
return this.store[key] !== undefined;
}
get(key) {
let val = this.store[key];
return val === UNDEFINED ? undefined : val;
}
set(key, val) {
this.store[key] = val === undefined ? UNDEFINED : val;
}
}
FAQs
A faster alternative to Object.create(null)
We found that blank-object demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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