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When listing properties of an object in the Chrome console, I stumbled upon notations I had never seen before. Indeed, some properties were outlined with <angle-brackets-properties> and the [[double-square-brackets-properties]] notations. Could anyone shed some light on:
You will find an example below:
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The dot notation is used mostly as it is easier to read and comprehend and also less verbose. The main difference between dot notation and bracket notation is that the bracket notation allows us to access object properties using variable.
There are two ways to access properties: dot notation and bracket notation.
The [] operator converts the expression inside the square brackets to a string. For instance, if it is a numeric value, JavaScript converts it to a string and then uses that string as the property name, similar to the square bracket notation of objects to access their properties.
Answer: Use console. log() or JSON. stringify() Method You can use the console. log() method, if you simply wants to know what's inside an object for debugging purpose. This method will print the object in browser console.
Most of what you're asking is answered here. Just like that answer I'll go ahead and quote the spec:
They are defined by this specification purely for expository purposes. An implementation of ECMAScript must behave as if it produced and operated upon internal properties in the manner described here. The names of internal properties are enclosed in double square brackets [[ ]]. When an algorithm uses an internal property of an object and the object does not implement the indicated internal property, a TypeError exception is thrown.
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