Given a nested JavaScript object, the task is to flatten the object and pull out all the values to a single depth. If the values are already at a single depth then it returns the result unaltered.
typeof() method:
The typeof() method is used in the script to check the type of JavaScript variable.
Syntax:
typeof(variable);
Parameters:
- Variable: The input variable.
Return Value: This method returns a string that contains the type of the passed variable.
Approach
- We make a function called flatten object which takes input of an object and returns an object.
-
Loop through the object and check the type of the current property:
- If it is of type Object and it is not an Array, recursively call the function again.
- Otherwise, store the value in the result.
- Return the object.
Example: In this example, we are following the above approach.
Javascript
// Declare an object let ob = { Company: "GeeksforGeeks" ,
Address: "Noida" ,
contact: +91-999999999,
mentor: {
HTML: "GFG" ,
CSS: "GFG" ,
JavaScript: "GFG"
}
}; // Declare a flatten function that takes // object as parameter and returns the // flatten object const flattenObj = (ob) => { // The object which contains the
// final result
let result = {};
// loop through the object "ob"
for (const i in ob) {
// We check the type of the i using
// typeof() function and recursively
// call the function again
if (( typeof ob[i]) === 'object' && !Array.isArray(ob[i])) {
const temp = flattenObj(ob[i]);
for (const j in temp) {
// Store temp in result
result[i + '.' + j] = temp[j];
}
}
// Else store ob[i] in result directly
else {
result[i] = ob[i];
}
}
return result;
}; console.log(flattenObj(ob)); |
Output
{ Company: 'GeeksforGeeks', Address: 'Noida', contact: -999999908, 'mentor.HTML': 'GFG', 'mentor.CSS': 'GFG', 'mentor.JavaScript': 'GFG' }