JavaScript Function Parameter || JS Tutorial for Beginners in Bengali 2022

Welcome To Code Bengali Channel we will see Function Parameter.

A JavaScript function does not perform any checking on parameter values (arguments).
function functionName(parameter1, parameter2, parameter3) {
// code to be executed
}

Function parameters are the names listed in the function definition.

Function arguments are the real values passed to (and received by) the function.

Parameter Rules
JavaScript function definitions do not specify data types for parameters.

JavaScript functions do not perform type checking on the passed arguments.

JavaScript functions do not check the number of arguments received.

Default Parameters
If a function is called with missing arguments (less than declared), the missing values are set to undefined.

Sometimes this is acceptable, but sometimes it is better to assign a default value to the parameter.

The Arguments Object
JavaScript functions have a built-in object called the arguments object.

The argument object contains an array of the arguments used when the function was called (invoked).

This way you can simply use a function to find (for instance) the highest value in a list of numbers

If a function is called with too many arguments (more than declared), these arguments can be reached using the arguments object.

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