javascript function default parameters

Published: 16 July 2024
on channel: CodeStack

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in javascript, default parameters allow you to specify default values for function parameters in case the arguments are not provided or are `undefined`. this can help prevent errors and provide a fallback value if needed.

here's a step-by-step tutorial with a code example to demonstrate how to use default parameters in javascript functions:

step 1: define a function with default parameters

in the above example, the `name` parameter of the `greet` function has a default value of `'guest'`. if the `name` argument is not provided when calling the function, it will default to `'guest'`.

step 2: call the function with and without arguments

in the first `console.log` statement, we provided the `name` argument as `'alice'`, so the function uses this value. in the second `console.log` statement, since no argument is provided, the default value of `'guest'` is used.

step 3: additional example with multiple default parameters

in the `ordercoffee` function, we have two default parameters `type` and `size`. in the first call, we provided both arguments `'cappuccino'` and `'large'`, so those values are used. in the second call, only the `type` argument is provided, so the default size of `'medium'` is used. in the third call, no arguments are provided, so both parameters default to `'medium'` and `'latte'`.

using default parameters in javascript functions can make your code more robust and easier to use by providing sensible defaults when needed.

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