获取并验证嵌套对象中的路径 - util 函数 #2-js教程-PHP中文网

Get and verify paths in a nested object - util functions #2

昨天我给大家分享了一个在 JS 中循环循环对象的实用函数，它的特点之一就是可以获取一个数组，其中包含嵌套对象的路径目前正在循环播放。但是，在使用嵌套对象时，您可能希望在任何给定时刻检索或验证特定路径中的数据，这就是当今实用函数的作用。

getDataFromObj(obj, path)：从对象中的给定路径检索数据
isValidObjPath(obj, path): 验证对象中是否存在给定路径

getDataFromObj(对象，路径)

请随意复制并粘贴此代码

/**
 * Retrieves data from an object on a given path
 * @param {Object} obj the object to get the data from
 * @param {string[]} path an array of strings containing the keys of the object to look at
 * @returns {*} the retrieved data or a Reference Error if not found
 */

function getDataFromObj(obj, path){
  // Validate arguments
  if(getType(obj) != "object"){
    throw TypeError("The `obj` argument is not an object");
  }
  if(getType(path) != "array"){
    throw TypeError("The `path` argument is not an array");
  }

  // Get the data or a ReferenceError if not found
  const data = (()=>{
    let currentData = obj;

    for(let i = 0; i < path.length; i +=1 ){
      if(Object.keys(currentData).includes(path[i])){
        currentData = currentData[path[i]];
        continue;
      } else{
        currentData = ReferenceError("The object path is not defined");
        break;
      }
    }
    return currentData;
  })();

  return data;
}

/**
 * A method to detect data types more accurately
 * Credits: Chris Ferdinandi, https://gomakethings.com/
 * @param {*} data the data to be verified
 * @returns {String} the data type
 */
function getType(data){
  return Object.prototype.toString.call(data).toLowerCase().slice(8, -1)
}

/**
 * License: MIT, https://opensource.org/license/mit
 * Copyright (c) 2024 Rodrigo Isaias Calix
 */

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用法：

您必须传递 2 个参数：
obj：要从中检索数据的对象
path：指示要遵循的顺序的数组

如果路径存在则返回该值（即使该值未定义），如果路径不存在则返回一个ReferenceError对象，它不会抛出错误，只是返回错误对象。

const products = {
  computers: {
    laptop: 20,
    desktop: 15,
    mini: 8
  },
  cameras: 20,
  externalDevices: {
    keyboard: {
      usb: 45,
      bluetooth: 25,
      other: undefined
    }
  }
}

// This would log 25
console.log(getDataFromObj(products, ["externalDevices", "keyboard", "bluetooth"]))

// this would return a ReferenceError object (not a throw, just the error object)
console.log(getDataFromObj(products, ["externalDevices", "mouse"]))

// this would return `undefined`
console.log(getDataFromObj(products, ["externalDevices", "keyboard", "other"]))

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isValidObjPath(obj, 路径)

实用程序代码：

/**
 * verify if an object has an specific path
 * @param {Object} obj the object to be verified
 * @param {string[]} path an array of strings containing the keys of the object to look at
 * @returns {Boolean} `true` if found, otherwise `false`
 */
function isValidObjPath(obj, path){
  // Validate arguments
  if(getType(obj) != "object"){
    throw TypeError("The `obj` argument is not an object");
  }
  if(getType(path) != "array"){
      throw TypeError("The `path` argument is not an array");
  }

  // shallow copy of the object to be verified
  let currentData = obj;

  // Verify the path
  for(let i = 0; i < path.length; i +=1 ){
    if(Object.keys(currentData).includes(path[i])){
      currentData = currentData[path[i]];
      continue;
    } else{
      return false;
    }
  }

  return true;
}

/**
 * A method to detect data types more accurately
 * Credits: Chris Ferdinandi, https://gomakethings.com/
 * @param {*} data the data to be verified
 * @returns {String} the data type
 */
function getType(data){
  return Object.prototype.toString.call(data).toLowerCase().slice(8, -1)
}

/**
 * License: MIT, https://opensource.org/license/mit
 * Copyright (c) 2024 Rodrigo Isaias Calix
 */

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用法：

您必须传递 2 个参数：
obj：要验证路径是否存在的对象
path：指示要遵循的顺序的数组

如果查找的路径存在，则返回true，否则返回false

const products = {
  computers: {
    laptop: 20,
    desktop: 15,
    mini: 8
  },
  cameras: 20,
  externalDevices: {
    keyboard: {
      usb: 45,
      bluetooth: 25,
      other: undefined
    }
  }
}

// This would log true
console.log(isValidObjPath(products, ["externalDevices", "keyboard", "bluetooth"]))

// this would log false
console.log(isValidObjPath(products, ["externalDevices", "mouse"]))

// this would log true
console.log(isValidObjPath(products, ["externalDevices", "keyboard", "other"]))

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