What is JavaScript AST, how to play with it?

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1.You can take a look at AST explorer. An online tool to explore the ASTs generated by more than 10 parsers. It is a good tool to learn AST tree of a language.
AST explorer source at Github.com.

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2.Also you can paste your js code into JavaScript AST visualizer and click “show ast” button, you will see the AST visully.

demo js code:

function foo(d) {
  d += 3;
    return d+999
}
function bar(d) {
    return d*100
}

js ast demo

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