Yahoo! JAPAN

2026/10/28 -Let's improve our function by adding some parameters, allowing us to call it with some different options. First of all, update the first line of the function:.

2026/10/15 -You can also have optional parameters by adding a question mark ? after the name of the parameter and before the colon : . 1function ...

2026/10/10 -The function* declaration creates a binding of a new generator function to a given name. A generator function can be exited and later re-entered, ...

2026/10/23 -Optional and default parameters in JSDoc: square brackets in @param, JavaScript defaults, and what tsc reports when a caller or the function gets it wrong.

2026/10/20 -The apply command takes a list containing arguments and body of a function, plus optional arguments to pass to the function. It then executes the function ...

2026/10/18 -Learn how JavaScript function parameters work, including ES6 default values and the ES2018 trailing comma so you can rearrange parameters without bugs.

2026/10/20 -The callback function will be called with two optional arguments: newLanguage (String): the 2-letter code of the language the page changed to.

2026/10/18 -Handling function inputs flexibly is critical for robust JavaScript functions, especially when dealing with optional or variable numbers of arguments in Kenyan ...

2026/10/13 -Call a function in JavaScript by name with parentheses, pass arguments, use anonymous functions and call methods on classes, with clear examples.