Answer by trincot for Does ES6 introduce a well-defined order of enumeration...
This question is about EcmaScript 2015 (ES6). But it should be noted that the EcmaScript2017 specification has removed the following paragraph that previously appeared in the specification for...
View ArticleAnswer by CertainPerformance for Does ES6 introduce a well-defined order of...
As covered in the other answer, ES2015 does not define enumeration order for the (very commonly used) property iteration methods for-in, Object.keys, and JSON.stringify, whereas it does define...
View ArticleAnswer by Oriol for Does ES6 introduce a well-defined order of enumeration...
Note: As of ES2020, even older operations like for-in and Object.keys are required to follow property order. That doesn't change the fact that using property order for fundamental program logic...
View ArticleDoes ES6 introduce a well-defined order of enumeration for object properties?
Does ES6 introduce a well-defined order of enumeration for object properties?var o = {'1': 1,'a': 2,'b': 3}Object.keys(o); // ["1", "a", "b"] - is this ordering guaranteed by ES6?for(let k in o) {...
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