JavaScript, How to sort an array which elements are objects?

How to sort an array which elements are objects?

To sort an array of objects, you can use the sort method in JavaScript, or similar methods in other programming languages, by providing a custom comparison function. This function will specify how to sort the objects based on one or more of their properties.

Here's an example in JavaScript:

const array = [

  { name: "Alice", age: 25 },

  { name: "Bob", age: 20 },

  { name: "Charlie", age: 30 }

];

// Sort by age in ascending order

array.sort((a, b) => a.age - b.age);

console.log(array);

In this example, we sort array by the age property in ascending order. The comparison function (a, b) => a.age - b.age returns a negative, zero, or positive number to indicate the order of a and b:

A negative value means a comes before b.

Zero means a and b are equal in terms of sorting.

A positive value means b comes before a.

Sorting by Multiple Properties

You can also sort by multiple properties, such as sorting by age first and then by name if ages are the same:

array.sort((a, b) => {

  if (a.age === b.age) {

    return a.name.localeCompare(b.name); // Sort by name if age is the same

  }

  return a.age - b.age; // Otherwise, sort by age

});

console.log(array);

Sorting in Descending Order

For descending order, simply reverse the comparison:

array.sort((a, b) => b.age - a.age);

These approaches apply to most programming languages, though the syntax might vary slightly depending on the language.