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First, install git.

Second, install Node.js. WebPPL is written in JavaScript, and requires Node to run. After it is installed, you can use npm (node package manager) to install WebPPL:

npm install -g webppl

Create a file called test.wppl:

var greeting = function () {
    return flip(.5) ? "Hello" : "Howdy"

var audience = function () {
    return flip(.5) ? "World" : "Universe"

var phrase = greeting() + ", " + audience() + "!"


Run it with this command:

webppl test.wppl


WebPPL is in active development. To update WebPPL, run:

npm update -g webppl