wcwilson1950 / hoj

Javascript programs based on the book Higher Order Perl

hoj

This respository is based on the book Higher Order Perl. I can read Pearl. Translating to javascript helps me understand the language better and extend my knowledge of javascript.

The website, Higher Order Javascript is also a source of inspiration for these experiments. This site is based on earlier versions of javascript and a lot of the language changes not shown.

Javascript Changes

Scope

Javascript now has block scope. It's possible to define constants and variables that exists only with the local scope:

const foo = 'bar';
{
    const foo = 'local';
    console.log(foo); // local
}
console.log(foo); // bar

Function Declarations

There are a number of ways to declare a function in Javascript. The one illustrated in HOJ is the function statement form.

function foo(bar) {
    return bar;
}

Another form is the function definition form.

const foo = function (bar) { return bar; };

This form actually creates an anonymous function that is assigned to 'foo'.