We learned how to set sane default values for the parameters in our JavaScript functions. You can also use function defaults one step further by using another parameter as the default. The product() ...

Notice that the first parameter of the applyOperation function is a function, which we will use as a callback. This is what allows us to pass a function as a parameter to another function.

The this parameter in JavaScript is like that oddly concealed obstacle on a path that keeps tripping people. For the JavaScript beginner, it is often a thing of much unclarity, while for many a fairly ...

The syntax of the rest parameter is just 3 dots followed by the array name. In the above ☝️ example, we do not have to know how many arguments are there in order to define parameters. Rather ...

The Rest parameter is a feature in JavaScript that allows you to represent an indefinite number of arguments as an array. It is denoted by three dots (...) followed by the name of the array that will ...

This is how by-reference variables have always worked in my mind. And so, I’ve always expected function parameters to work the same. But apparently method parameters don’t work this way. Based on the ...