JS AST Example

ast.json

{
    "type": "Program",
    "body": [
        {
            "type": "IfStatement",
            "test": {
                "type": "BinaryExpression",
                "operator": ">",
                "left": {
                    "type": "CallExpression",
                    "callee": {
                        "type": "MemberExpression",
                        "computed": false,
                        "object": {
                            "type": "Identifier",
                            "name": "Math"
                        },
                        "property": {
                            "type": "Identifier",
                            "name": "random"
                        }
                    },
                    "arguments": []
                },
                "right": {
                    "type": "Literal",
                    "value": 0.5,
                    "raw": "0.5"
                }
            },
            "consequent": {
                "type": "BlockStatement",
                "body": [
                    {
                        "type": "ExpressionStatement",
                        "expression": {
                            "type": "CallExpression",
                            "callee": {
                                "type": "MemberExpression",
                                "computed": false,
                                "object": {
                                    "type": "Identifier",
                                    "name": "console"
                                },
                                "property": {
                                    "type": "Identifier",
                                    "name": "log"
                                }
                            },
                            "arguments": [
                                {
                                    "type": "Literal",
                                    "value": "More than half!",
                                    "raw": "'More than half!'"
                                }
                            ]
                        }
                    }
                ]
            },
            "alternate": {
                "type": "IfStatement",
                "test": {
                    "type": "BinaryExpression",
                    "operator": "===",
                    "left": {
                        "type": "BinaryExpression",
                        "operator": "%",
                        "left": {
                            "type": "CallExpression",
                            "callee": {
                                "type": "MemberExpression",
                                "computed": false,
                                "object": {
                                    "type": "NewExpression",
                                    "callee": {
                                        "type": "Identifier",
                                        "name": "Date"
                                    },
                                    "arguments": []
                                },
                                "property": {
                                    "type": "Identifier",
                                    "name": "getHours"
                                }
                            },
                            "arguments": []
                        },
                        "right": {
                            "type": "Literal",
                            "value": 2,
                            "raw": "2"
                        }
                    },
                    "right": {
                        "type": "Literal",
                        "value": 0,
                        "raw": "0"
                    }
                },
                "consequent": {
                    "type": "BlockStatement",
                    "body": [
                        {
                            "type": "ExpressionStatement",
                            "expression": {
                                "type": "CallExpression",
                                "callee": {
                                    "type": "MemberExpression",
                                    "computed": false,
                                    "object": {
                                        "type": "Identifier",
                                        "name": "console"
                                    },
                                    "property": {
                                        "type": "Identifier",
                                        "name": "log"
                                    }
                                },
                                "arguments": [
                                    {
                                        "type": "Literal",
                                        "value": "Even hour!",
                                        "raw": "'Even hour!'"
                                    }
                                ]
                            }
                        }
                    ]
                },
                "alternate": {
                    "type": "BlockStatement",
                    "body": [
                        {
                            "type": "ExpressionStatement",
                            "expression": {
                                "type": "CallExpression",
                                "callee": {
                                    "type": "MemberExpression",
                                    "computed": false,
                                    "object": {
                                        "type": "Identifier",
                                        "name": "console"
                                    },
                                    "property": {
                                        "type": "Identifier",
                                        "name": "log"
                                    }
                                },
                                "arguments": [
                                    {
                                        "type": "Literal",
                                        "value": "Less than half and odd hour!",
                                        "raw": "'Less than half and odd hour!'"
                                    }
                                ]
                            }
                        }
                    ]
                }
            }
        }
    ],
    "sourceType": "script"
}

if.js

if (Math.random() > 0.5) {
    console.log('More than half!');
} else if (new Date().getHours() % 2 === 0) {
    console.log('Even hour!');
} else {
    console.log('Less than half and odd hour!')
}