Lodash is currently the most dependent library in the npm package, but if you use ES6, you may not actually need it. This article will explore how to combine native collection methods, arrow functions and other new ES6 features to simplify the code of many common scenarios.
Core points
- Lodash is currently the most dependent library in the npm package, but in some cases, using ES6 can eliminate the need for it.
- ES6 features, such as native set methods, arrow functions, deconstruction syntax, and rest and spread operators, can replace common functions of Lodash, such as
map,filter,reduce,head,tail& and rest and spread. -
curryES6 can also use arrow functions, rest parameters and spread operators to replace Lodash'spartial,pick, operators, paths,constant,identity,noop, , and chains Functions such as style call. - Although Lodash is still a very valuable library, the evolutionary version of JavaScript (ES6) provides a new way to solve problems previously handled by utility modules such as Lodash.
-
Map, Filter, Reduce
These collection methods make data transformation a breeze and are almost universally supported. We can use them in combination with arrow functions to write concise code to replace the implementation provided by Lodash:
// Lodash
_.map([1, 2, 3], function(n) { return n * 3; });
// [3, 6, 9]
_.reduce([1, 2, 3], function(total, n) { return total + n; }, 0);
// 6
_.filter([1, 2, 3], function(n) { return n % 2; });
// [1, 3]
// ES6
[1, 2, 3].map(n => n * 3);
[1, 2, 3].reduce((total, n) => total + n, 0);
[1, 2, 3].filter(n => n % 2);
findThis is not all. If we are using a modern browser, we can also use some, every, reduceRight and
-
Head & Tail
Deconstruction syntax allows us to get the head and tail of a list without the need for practical functions:
// Lodash _.head([1, 2, 3]); // 1 _.tail([1, 2, 3]); // [2, 3] // ES6 const [head, ...tail] = [1, 2, 3];
You can also get the initial element and the last element similarly:
// Lodash _.initial([1, 2, 3]); // -> [1, 2] _.last([1, 2, 3]); // 3 // ES6 const [last, ...initial] = [...[1, 2, 3]].reverse();
reverseIf you think reverse will modify the data structure, you can use the spread operator to clone the array before calling
-
Rest and Spread
The
rest and spread functions allow us to define and call functions that accept variable number of parameters. ES6 introduces a special syntax for these two operations:-
Curry
Without a high-level language like TypeScript or Flow, we cannot provide type signatures for functions, which makes currying quite difficult. When we receive the curried function, it is difficult to know how many parameters have been provided and what parameters need to be provided next. Using arrow functions, we can explicitly define curried functions to make them easier to understand by other programmers:
-
Partial
Like currying, we can use the arrow function to make some applications simple and clear:
-
Operators
Lodash contains many functions that reimplement syntax operators into functions so that they can be passed to collection methods. In most cases, arrow functions make them simple and short enough that we can define them inline:
-
Paths
Many functions of Lodash use paths as strings or arrays. We can use the arrow function to create more reusable paths:
-
Pick
pick utility allows us to select the desired attribute from the target object. We can achieve the same result using deconstruction and abbreviation object literals:
-
Constant, Identity, Noop
Lodash provides some utilities for creating simple functions with specific behavior:
-
Chaining & Flow
Lodash provides some functions to help us write chained statements. In many cases, the built-in collection method returns an array instance that can be directly chained, but this is not possible in cases where some methods modify the collection. However, we can define the same conversion as an array of arrow functions:
Conclusion
Lodash is still a great library, and this article is just a new perspective on how the evolved version of JavaScript can let us solve some problems in the past reliance on utility modules. Don't ignore it. Instead, next time you need an abstraction, consider whether a simple function can be replaced!
(The FAQs part is omitted, because it has nothing to do with the code pseudo-originality and is longer)
The above is the detailed content of 10 Lodash Features You Can Replace with ES6. For more information, please follow other related articles on the PHP Chinese website!
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