5b Question

A function in JavaScript is a set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should take some input and return an output where there is some obvious relationship between the input and the output. JavaScript has five functions built into the language. They are eval, parseInt, parseFloat, escape, and unescape. When you define a function you give a name to a set of actions you want the computer to perform. When you call a function you are telling the computer to run (or execute) that set of actions. Functions are data, and therefore can be passed around just like other values. This means a function can be passed to another function as an argument. This allows the function being called to use the function argument to carry out its action.