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The dot notation and bracket notation both are used to access the object properties in JavaScript. The dot notation is mostly used as it is easier to read and comprehend. So why should we use bracket notation and what is the difference between then? well, the bracket notation [] allows us to access object properties using variables because it ...
I came across a case where I thought I wanted to pass the "address" of an object property as data to another function and populate the object (with AJAX), do lookup from address array, and display in that other function. I couldn't use dot notation without doing string acrobatics so I thought an array might be nice to pass instead.
JSON (JavaScript Object Notation) is a lightweight format that is used for data interchanging. It is based on a subset of JavaScript language (the way objects are built in JavaScript). As stated in the MDN, some JavaScript is not JSON, and some JSON is not JavaScript. An example of where this is used is web services responses.
function propertyAccessor(object, keys, array) { /* Retrieve an object property with a dot notation string. @param {Object} object Object to access. @param {String} keys Property to access using 0 or more dots for notation. @param {Object} [array] Optional array of non-dot notation strings to use instead of keys.
As we can see data is an object, hence we can access its properties using dot notation. The items property is accessed as follows: data.items The value is an array, to access its second element, we have to use bracket notation: data.items[1] This value is an object and we use dot notation again to access the name property. So we eventually get:
The object created using the above method (new Object(1)) would be converted to object type if a property is added to it. var obj = new Object(1); typeof obj // "number" obj.a = 2; typeof obj // "object" If the object is a copy of a child class of object, we could add the property without the type conversion.
recent note: While I'm flattered that this answer has gotten many upvotes, I am also somewhat horrified. If one needs to convert dot-notation strings like "x.a.b.c" into references, it could (maybe) be a sign that there is something very wrong going on (unless maybe you're performing some strange deserialization).
JavaScript Object Notation (JSON) is a text format for the serialization of structured data. It is derived from the object literals of JavaScript, as defined in the ECMAScript Programming Language Standard, Third Edition [ECMA-262].
I just cleared my mind on JavaScript objects and my question is really simple for most of the people here. I feel comfortable with the JavaScript object literal notation like: var Obj = { /** * @type {string} */ name: '', /** * setName * Set the `name` property.
JSON.stringify turns a Javascript object into JSON text and stores that JSON text in a string. The conversion is an Object to String. JSON.parse turns a string of JSON text into a Javascript object. The conversion is a String to Object. var j={"name":"binchen"}; to make it a JSON String following could be used.