Topic Description

Create a get utility function that takes three parameters:

• object: The target object to access the value from
• path: The path to the desired property or nested property within the object, expressed as a string
• defaultValue: The default value to return if the specified path does not exist in the object

The get function should recursively navigate the object structure based on the provided path and return the corresponding value if it exists. If the path does not lead to a valid property or the object is undefined/null, it should return the provided defaultValue.

const object = { a: [{ b: { c: 3 } }] };

console.log(get(object, 'a[0].b.c')); // => 3
console.log(get(object, 'a[0][b][c]')); // => 3
console.log(get(object, 'a[100].b.c', 'default')); // => 'default'

Answer

function get(object, pathParam, defaultValue) {
  if (object == null) {
    return defaultValue;
  }

  let count = 0;
  const path = pathParam.split(/[\\.\\[\\]]/)
  console.log('path is an array: ',path)
  const length = path.length;

  while (object != null && count < length) {
    const key = path[count]
    if (key) {
	    object = object[key];
    }
		count++
  }

  
  const result = count && count === length ? object : undefined;
 
  return result === undefined ? defaultValue : result;
}

function get(object, pathParam, defaultValue) {
  if(object == null){
	  return defaultValue
  }
  let index = 0
  const regex = /[.\\[\\]]/g
	const pathArray = pathParam.split(regex)
	console.log('path is an array: ',pathArray)
	const len = pathArray.length
	
	while(index < len && object){
		const key = pathArray[index]
		if(key){
			object = object[key]
		}
		index++
	}
	const result = (index == len && object) ? object : defaultValue
	return result
}