What are Properties and Methods in object oriented programming?

Answer 1

Properties in JavaScript van be thought of as a variable inside of an Object.

While:

var foo = 'bar';

is a variable.

Here:

var foo = {bar:'baz'};

bar is a property of the foo object.

You van also assign properties to an object in an array/hash-map like way, using square braces like follows:

foo['qux'] = 'spam';

The main difference here is the use of quotes to delimit the property name. Note also that in the current JavaScript version (ES 3) you cannot use reserved words (i.e. for, in function, brake or etc.) as property names without delimiting the names with quotes (' or ").

Properties can also hold functions, and when the do they are called methods (of the object).

Mainly properties are used either as normal variables, just within the namespace of the enclosing object. Or they are used as indexes when using objects like associative arrays/hash-maps/dictionaries/word-list/array-lists. It is btw. discouraged to use javascript arrays non-numeric indexes, since such arrays wil be treated much like objects, normal objects should be used.

Answer 2

Properties in JavaScript van be thought of as a variable inside of an Object.

While:

var foo = 'bar';

is a variable.

Here:

var foo = {bar:'baz'};

bar is a property of the foo object.

You van also assign properties to an object in an array/hash-map like way, using square braces like follows:

foo['qux'] = 'spam';

The main difference here is the use of quotes to delimit the property name. Note also that in the current JavaScript version (ES 3) you cannot use reserved words (i.e. for, in function, brake or etc.) as property names without delimiting the names with quotes (' or ").

Properties can also hold functions, and when the do they are called methods (of the object).

Mainly properties are used either as normal variables, just within the namespace of the enclosing object. Or they are used as indexes when using objects like associative arrays/hash-maps/dictionaries/word-list/array-lists. It is btw. discouraged to use javascript arrays non-numeric indexes, since such arrays wil be treated much like objects, normal objects should be used.

From: What_is_JavaScript_properties