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重构 - 删除死代码

Barbara Streisand

Dec 29, 2024 pm 05:34 PM

清理垃圾

TL;DR：消除未使用的函数、常量和“以防万一”代码。

解决的问题

死代码
以防万一代码
可维护性降低
锚船
认知负荷

代码气味 09 - 死代码

马克西·孔蒂耶里・2020 年 10 月 28 日

#codenewbie ＃教程

代码气味 54 - 锚船

马克西·孔蒂耶里・21 年 1 月 6 日

#codenewbie #webdev ＃教程 #cleancode

代码气味 148 - 待办事项

马克西·孔蒂耶里・ 22 年 7 月 13 日

#javascript #webdev #初学者＃编程

步骤

确保您的代码具有良好的功能覆盖率。
通过检查代码或使用静态分析工具来识别未使用的函数和常量。
分析添加的推测代码，以防万一。
删除任何不必要或未使用的内容。
对您的代码执行全面的回归测试。

示例代码

前

from flask import Flask, jsonify, make_response

app = Flask(__name__)

HTTP_100_CONTINUE = 100
HTTP_202_ACCEPTED = 202  # Not used
HTTP_204_NO_CONTENT = 204 # Not Used
HTTP_302_FOUND = 302 # Not Used
HTTP_400_BAD_REQUEST = 400  # Not Used
HTTP_401_UNAUTHORIZED = 401 # Not Used
HTTP_403_FORBIDDEN = 403
HTTP_404_NOT_FOUND = 404
HTTP_410_GONE = 410
HTTP_500_INTERNAL_SERVER_ERROR = 500
HTTP_501_NOT_IMPLEMENTED = 501

probe_telemetry = {
    "temperature": {"solar_panels": 150, "instrument_1": 50},
    "position": {"x": 1000000, "y": 2000000, "z": 3000000, 
    "velocity": {"vx": 100, "vy": 200, "vz": 300}},
    "status": {"power_level": 95, "communication_status": "OK"}
}

@app.route('/api/v1/probe/telemetry', methods=['GET'])
def get_telemetry():
    return jsonify(probe_telemetry), HTTP_200_OK

# The following function is not invoked 
# and not implemented
# It is a dead placeholder
@app.route('/api/v1/probe/send_command', methods=['POST'])
def send_command():
    return jsonify({"message": "Command endpoint not implemented yet."}), 
       HTTP_501_NOT_IMPLEMENTED

@app.route('/api/v1/probe/data', methods=['GET'])
def get_data():
    return jsonify({"message": "Data not found"}), 
       HTTP_404_NOT_FOUND

@app.route('/api/v1/probe/redirect', methods=['GET'])
def redirect_endpoint():
    response = make_response(jsonify({"message": "Redirecting..."}), 
       HTTP_301_MOVED_PERMANENTLY)
    response.headers['Location'] = '/api/v1/probe/telemetry'
    return response

@app.route('/api/v1/probe/not_modified', methods=['GET'])
def not_modified_endpoint():
    response = make_response(jsonify({"message": "Not Modified"}), 
       HTTP_304_NOT_MODIFIED)
    response.headers['ETag'] = 'some_etag'
    return response

@app.route('/api/v1/probe/gone', methods=['GET'])
def gone_endpoint():
    return jsonify({"message": "Resource permanently gone"}),
       HTTP_410_GONE

后

# 1. Ensure your code has good functional coverage.

from flask import Flask, jsonify, make_response
from http import HTTPStatus

app = Flask(__name__)

# 2. Identify unused functions and constants 
# by reviewing your code or using static analysis tools.
HTTP_200_OK = HTTPStatus.OK
HTTP_301_MOVED_PERMANENTLY = HTTPStatus.MOVED_PERMANENTLY
HTTP_304_NOT_MODIFIED = HTTPStatus.NOT_MODIFIED
HTTP_404_NOT_FOUND = HTTPStatus.NOT_FOUND
HTTP_410_GONE = HTTPStatus.GONE
HTTP_501_NOT_IMPLEMENTED = HTTPStatus.NOT_IMPLEMENTED

probe_telemetry = {
    "temperature": {"solar_panels": 150, "instrument_1": 50},
    "position": {"x": 1000000, "y": 2000000, "z": 3000000, 
    "velocity": {"vx": 100, "vy": 200, "vz": 300}},
    "status": {"power_level": 95, "communication_status": "OK"}
}

@app.route('/api/v1/probe/telemetry', methods=['GET'])
def get_telemetry():
    return jsonify(probe_telemetry), HTTP_200_OK

# 3. Analyze the added speculative code, just in case.

@app.route('/api/v1/probe/send_command', methods=['POST'])
def send_command():
    return jsonify({"message": "Command endpoint not implemented yet."}), 
       HTTP_501_NOT_IMPLEMENTED

@app.route('/api/v1/probe/data', methods=['GET'])
def get_data():
    return jsonify({"message": "Data not found"}), 
      HTTP_404_NOT_FOUND

# 4. Remove anything unnecessary or unused.

# 5. Perform comprehensive regression testing on your code.