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2026-03-09 10:45 Diff
https://htmlacademy.org/courses/javascript-programming/functions/summary-1

Function example.

var calculateSum = function (numberFirst, numberSecond) { var sum = numberFirst + numberSecond; return sum; }; calculateSum(); // Will return NaN calculateSum(2); // Will return NaN calculateSum(2, 5); // Will return 7 calculateSum(9, 5); // Will return 14

In this example:

  • calculateSum is the name you can use to call the function.
  • numberFirst, numberSecond are function parameters.
  • return sum; is the place in the code where sum is returned and where we exit the function.
  • calculateSum(2, 5); are arguments that are transferred in the function when it is called. The order of the arguments is the same as for the function parameters. The first argument 2 is written to the first parameter numberFirst, argument 5 is written to parameter numberSecond. It’s important to observe the parameter order when calling the function in order to avoid errors that are not obvious.

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