What is the most efficient way to create multiple nested property objects in a shorter amount of time?

Question

What is the most efficient way to create multiple nested property objects in a shorter amount of time?

Currently, I am utilizing mongoDB for a data migration project where queries are written in plain JavaScript/JSON format:

queryObj = {}; // main object passed to mongodb for queries

The code snippet below is causing an error:

queryObj[inObj.row]['$eq'] = inObj.equals;

However, the following code snippet works without any issues:

queryObj[inObj.row[i]] = {};
queryObj[inObj.row]['$eq'] = inObj.equals;

Is there an easier way to create objects with multiple nested properties without explicitly defining each one as an object? Perhaps using Object.create or another built-in solution?

javascript mongodb

Answer 1

Answer №1

If you need to ensure that certain objects exist, one approach is to create a method that generates empty objects when necessary.

/**
 * To establish a deep property on an object, generate any mandatory
 * objects within the hierarchy that may not presently exist
 * @param {object} obj The target object for properties
 * @param {string} prop Dot-separated deep property to assign
 * @param {*} value Value to assign to the property
 */
function setProp(obj, prop, value) {
  var parts = prop.split('.');
  var i = 0;

  for (; i < parts.length - 1; i++) {
    if (typeof obj[parts[i]] === 'undefined') {
      obj[parts[i]] = {};
    }
    obj = obj[parts[i]];
  }
  // Keep in mind that parts[i] points to the last part of the deep property name
  // and obj refers to the nested object containing the last deep property
  obj[parts[i]] = value;
}

   
var obj = {}
setProp(obj, 'a.b.c', 3);

console.log(obj.a.b.c); // 3

In your scenario, you could do something like this:

setProp( queryObj, inObj.row + ".$eq", inObj.equals );

Answer 2

If you need to ensure that certain objects exist, one approach is to create a method that generates empty objects when necessary.

/**
 * To establish a deep property on an object, generate any mandatory
 * objects within the hierarchy that may not presently exist
 * @param {object} obj The target object for properties
 * @param {string} prop Dot-separated deep property to assign
 * @param {*} value Value to assign to the property
 */
function setProp(obj, prop, value) {
  var parts = prop.split('.');
  var i = 0;

  for (; i < parts.length - 1; i++) {
    if (typeof obj[parts[i]] === 'undefined') {
      obj[parts[i]] = {};
    }
    obj = obj[parts[i]];
  }
  // Keep in mind that parts[i] points to the last part of the deep property name
  // and obj refers to the nested object containing the last deep property
  obj[parts[i]] = value;
}

   
var obj = {}
setProp(obj, 'a.b.c', 3);

console.log(obj.a.b.c); // 3

In your scenario, you could do something like this:

setProp( queryObj, inObj.row + ".$eq", inObj.equals );

What is the most efficient way to create multiple nested property objects in a shorter amount of time?

Answer №1

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