2026/8/22 -Optional parameters allow a JavaScript function to work even when some arguments are not provided. They make functions more flexible and reusable.
2026/10/23 -Optional parameters come last. A required parameter after an optional one has to be passed anyway, so put the optional ones at the end, or collect them in one ...
2026/10/15 -Optional Parameters. You can also have optional parameters by adding a question mark ? after the name of the parameter and before the colon : . 1function ...
2026/9/24 -A default value makes the parameter optional for callers and gives it a type without undefined inside the function. The type is inferred from the default, so ...
2026/10/28 -If we want to specify parameters inside parentheses for the function we are calling, then we can't call it directly — we need to put it inside an anonymous ...
2026/10/9 -You can define a parameter as optional by either adding = after the parameter type or enclosing the parameter name in [] . Parameters defined as optional in ...
2026/9/23 -Optional parameters allow functions to be called without providing values for every parameter, making them more flexible. · Optional parameters can be omitted ...
2026/6/7 -Master function parameters: default values, rest parameters, argument validation, and passing by value vs reference.
2026/1/7 -The issue is your OrderInfo has onSale defined. So either make it optional and in your order function so something like: if((orderInfo.onSale ?? true) === true ...
2026/9/10 -Optional and Default Parameters. Add ? after the name to make a parameter optional. Its type becomes number | undefined inside the function, so you have ...