How to use the sortBy function from underscore

underscore.sortBy is a function that sorts a collection by a specified property or function and returns a new sorted collection.

How does underscore.sortBy work?

underscore.sortBy is a function from the Underscore.js library that takes a collection of values and a function (or a string indicating a property name), and returns a new sorted collection based on the result of applying the function to each element in the collection.

Here's how it works:

1. The collection is iterated over, and the function is applied to each element in the collection.
2. The result of the function is then used to sort the collection in ascending order.
3. If a string is passed instead of a function, _.property is used to create a function that will return the value of the specified property on an object.
4. If the result of applying the function to two elements is equal, the elements are ordered based on their original position in the collection.

The sorted collection is returned as a new array, leaving the original collection unchanged.

Note that underscore.sortBy is a stable sort, which means that if two elements in the collection have the same sort value, their original order will be preserved in the sorted collection.

underscore.sortBy is useful in a wide range of scenarios where you need to sort a collection of data based on a specific property or function. It's often used in functional programming-style code, as well as in data visualization, user interface development, and other contexts.

Ai Example

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const people = [
  { name: "Alice", age: 25 },
  { name: "Bob", age: 30 },
  { name: "Charlie", age: 20 },
];

const sortedPeople = _.sortBy(people, "age");

console.log(sortedPeople);
// Output:
// [
//   { name: "Charlie", age: 20 },
//   { name: "Alice", age: 25 },
//   { name: "Bob", age: 30 }
// ]

In this example, we start with an array of three objects representing people, each with a name and an age. We pass this array to _.sortBy, along with the string "age", which tells _.sortBy to sort the array based on the age property of each object. After sorting the array, _.sortBy returns a new array with the same objects, but in a different order: first Charlie (age 20), then Alice (age 25), and finally Bob (age 30). Note that _.sortBy does not modify the original array. Instead, it returns a new sorted array, leaving the original array unchanged.