JavaScript Day 42 — Mastering JavaScript Basics: A Comprehensive Guide for Interview Preparation
100 Days of JavaScript Interview Prep: A Beginner’s Journey
Question 1 — How to sort an array of objects based on a car age ?
const cars = [
{ name: 'i10', age: 10 },
{ name: 'magna', age: 25 },
{ name: 'ford', age: 35 },
];Answer -
First Solution
[...cars].sort((a,b)=>{
return a.age - b.age ;
})
console.log(cars)Second Solution
function compareAge(a, b) {
return a.age - b.age;
}
// Sort the array based on age
cars.sort(compareAge);
console.log(cars);Question 2 — How to sort an array of objects based to dynamic key?
const cars = [
{ make: 'Toyota', model: 'Corolla', year: 2018 },
{ make: 'Honda', model: 'Civic', year: 2019 },
{ make: 'Ford', model: 'Focus', year: 2017 },
];Answer
Step 1 — Create the custom function
Step 2 — Access the dynamic key with array.sort
a[key]andb[key]access the values of the objects based on the dynamic key
Step 3 — Use the compare condition and return
Step 4 — Use sortByKey method
sortByKeyfunction takes an array of objects and a dynamic key as parameters.
// Function to sort array of objects based on dynamic key
function sortByKey(array, key) {
return array.sort((a, b) => {
// Access the values of the objects using the dynamic key
const valueA = a[key];
const valueB = b[key];
// Compare the values
if (valueA < valueB) return -1;
if (valueA > valueB) return 1;
return 0;
});
}
// Sort cars array based on the 'year' key
const sortedCarsByModel = sortByKey(cars, 'model');
console.log(sortedCarsByModel);Happy Coding and Stay Tuned :)
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