V8 Object takeaway
- Array-indexed properties are stored in a separate elements store.
- Named properties are stored in the properties store.
- Elements and properties can either be arrays or dictionaries.
- Each JavaScript object has a HiddenClass associated that keeps
Element
function Foo() { this[100] = 'test-100' this[1] = 'test-1' this["B"] = 'bar-B' this[50] = 'test-50' this[9] = 'test-9' this[8] = 'test-8' this[3] = 'test-3' this[5] = 'test-5' this["A"] = 'bar-A' this["C"] = 'bar-C' } var bar = new Foo() for(key in bar){ console.log(`index:${key} value:${bar[key]}`) } 
Property
function Foo2(property_num,element_num) { for (let i = 0; i < element_num; i++) { this[i] = `element${i}` } for (let i = 0; i < property_num; i++) { let ppt = `property${i}` this[ppt] = ppt }} var bar2 = new Foo2(20, 10) 
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