4 ms·

I’m pretty sure this is wrong. JS objects and arrays are different. The former will only yield elements from the array itself when iterated on, and has a consis

I’m pretty sure this is wrong. JS objects and arrays are different. The former will only yield elements from the array itself when iterated on, and has a consistent iteration order, while the later does not.

mncharity 7y ago
https://www.ecma-international.org/ecma-262/#sec-array-exotic-objects https://www.ecma-international.org/ecma-262/#sec-array-exoti...
TurningCanadian 7y ago
Order is consistent in both https://www.stefanjudis.com/today-i-learned/property-order-is-predictable-in-javascript-objects-since-es2015/ https://www.stefanjudis.com/today-i-learned/property-order-i...
cutler 7y ago
JS arrays are array-like objects. That's the official line anyway.
azernik 7y ago
That's because arrays happen to override the special [Symbol.iterator] method: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/@@iterator https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... Arrays are objects of class Array which have special literals, override the toString() method, and update the non-enumerable "length" property on certain operations. Try calling Object.keys([1, 2, 3]), or even better try Object.getOwnPropertyNames([1, 2, 3])