But note that no single mechanismĪll of an object's properties the various mechanismsĮach include different subsets of properties. The order was first defined for own properties only in ECMAScriptĢ015 ECMAScript 2020 defines order for inherited properties as well.Ībstract specification operations. This was not always the case, and the order is complex. Way: A Map object iterates entries, keys, and values inĪlthough the keys of an ordinary Object are ordered now, The keys in Map are ordered in a simple, straightforward ()Ī Map's keys can be any value (including functions,.Deprecated Object.prototype._lookupSetter_().Deprecated Object.prototype._defineSetter_().Deprecated Object.prototype._defineGetter_().
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January 2023
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