In javascript, every object has a bunch of built-in key-value pairs that have meta-information. When you loop through all the key-value pairs for an object you' ... ... <看更多>

The for...in loop over the enumerable properties that are keyed by strings of an object. Note that a property can be keyed by a string or a symbol. ... <看更多>

benchmark-compare-keys-vs-loop-obj-iteration.spec.js. This file contains bidirectional ... .add('iterating using object keys', function () {. let arr = [];. ... <看更多>

One of the simplest and probably fastest way to do it would be to store the keys to ignore in a fast lookup structure, such as using an object as a map. ... <看更多>