default parameters in javascript

in javascript, default parameters allow you to set default values for function parameters in case the arguments are not passed or are `undefined`. this feature was introduced in ecmascript 6 (es6) to provide a more concise and flexible way to handle function parameters.

when defining a function, you can specify default parameter values by assigning them directly in the function's parameter list. if an argument is not passed when the function is called, the default value will be used instead.

here is an example to demonstrate default parameters in javascript:

in the `greet` function, we have set the default parameter `name` to `'guest'`. when the function is called without any argument, the default value is used. however, when an argument is provided, it overrides the default value.

default parameters can also be expressions or function calls. here's an example:

in this example, the `calculatearea` function calculates the area of a rectangle using default values for `width` and `height`. you can pass one argument, both arguments, or no arguments, and the function will still work correctly due to the default parameters.

default parameters are a powerful feature in javascript that can help you write cleaner and more robust code by providing fallback values for function arguments.

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