Default parameters in JS

Default parameters can:

• Use previous values
• Call functions (that have already been declared)

This includes calling functions using values of previous parameters.

    const printUserDetails(first, last, full = combineStrings(first, last), firstLetter = first[0]) => {};

https://codepen.io/ajosedev/pen/wvBaVja https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters

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