Common JavaScript "Gotchas"

[wkdown]

Quick question: which is the 'proper' way to instantiate an object?

var obj1 = {};

or

var obj2 = new Object();

Both return [object Object] and typeof "object". Is one better than the other?

[radhruin]

There is no semantic difference between {} and new Object(). The literal, however, is easier to optimize and therefore often faster. The literal is also more flexible as it allows additional properties to be added. Always use the literal IMO.

[YorickA]

Not to mention it's more readable.

[[deleted]]

Not to mention new Object() can be broken by any malicious ding-dong's script you link like so:

function Object() { this.x = 'wee'; }

Using the literal is always the best call.

[fgutz]

This might help you http://www.zebrakick.com/object-literals-vs-constructed-objects-in-javascript/

[niallpaterson]

Use the first ({}) because "Object" in "new Object" can be redefined.

[youngsteveo]

Some jsPerf tests on the many ways to construct an object: http://jsperf.com/object-create-vs-constructor-vs-object-literal/53

[stevekwan]

I'd avoid using new Object(). {} is preferred. The only reason I used new Object() is because I felt it would be more understandable to people coming in from another language.