Dot notation vs bracket notation in javascript

dot notation and bracket notation are two ways to access and manipulate properties of objects in javascript.

### dot notation:
- dot notation is the most common way to access object properties.
- it is simpler and more concise than bracket notation.
- it is used when the property name is a valid identifier (starts with a letter, underscore, or dollar sign).

### bracket notation:
- bracket notation is used when the property name is not a valid identifier or when the property name is dynamic.
- it allows you to access properties using variables or expressions.
- it is also useful for accessing properties with special characters or spaces in their names.

### key differences:
- dot notation is easier to read and write, especially for static property names.
- bracket notation is versatile and can be used for dynamic properties.
- dot notation cannot be used with property names that are not valid identifiers.

in general, it is recommended to use dot notation for simpler cases and bracket notation for more complex scenarios.

remember that both notations achieve the same goal of accessing object properties, so choose the one that best fits your needs and coding style.

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