object-literal

This question already has an answer here: How to use a variable for a key in a JavaScript object literal? 12 answers i.e. is it possible to do this: var fruit = "banana"; var x = { "app" + "le" : 5, // "apple" : 5 function(){return "orange"} : 8, // "orange" : 8 "" + fruit : 3 // "banana" : 3 }; No, you can't, you need to feed it after the first initialization : var myKeyName = "bar"; x[myKeyName] = "foo"; You need to declare the empty object and build the strings after. An object literal expects valid strings for its names If you don't run the function for 'orange' as well as define it, the

json2.js is strict requiring all object keys be double-quoted. However, in Javascript syntax {"foo":"bar"} is equivalent to {foo:"bar"} . I have a textarea that accepts JSON input from the user and would like to "ease" the restriction on double quoting the keys. I've looked at how json2.js validates a JSON string in four stages before it evals it. I was able to add a 5th stage to allow unquoted keys and would like to know if there are any security implications to this logic. var data = '{name:"hello", age:"23"}'; // Make sure the incoming data is actual JSON // Logic borrowed from http://json

What does this code refer too? queryString: function() { //some code } I tested it in the WebConsole (Firefox) but it wouldn't execute, so I'm thinking that it isn't equivalent to function queryString() {} . So what is it exactly? You are missing some code there, but I assume its part of an object declaration like this: var obj = { queryString: function() { //some code } }; obj.queryString(); It assigns a function as a property of an object literal. It would be equivalent to this: var obj = {}; obj.queryString = function() { ... }; obj.queryString(); In general, the object literal syntax looks

This question already has an answer here: What is the difference between object keys with quotes and without quotes? 6 answers I see this all the time: object literals declared such that some keys are surrounded with quotes and others are not. An example from jQuery 1.4.2: jQuery.props = { "for": "htmlFor", "class": "className", readonly: "readOnly", maxlength: "maxLength", cellspacing: "cellSpacing", rowspan: "rowSpan", colspan: "colSpan", tabindex: "tabIndex", usemap: "useMap", frameborder: "frameBorder" }; What is the significance of wrapping the first two property keys ( for and class )

Object literal =name value pairs wrapped in curly braces. Constructor =a function used to create multiple instance using keyword new. Prototype =for extension of a literal. This is what I have understood till now.But the more I research,More I get confused about what is the significance of each one of them. I have used constructor,protoypes and literals in my code a few times.But everytime I use them,I feel like I am still not aware of the full potential of it .I want to go one step ahead of being a begineer now.I hope Folks at stackoverflow help me achieve it Which is the best preferred way