New features of es6 for front-end interviews

ES6 (also known as ECMAScript 2015) is a new standard for the JavaScript language that introduces a number of new features and syntactic sugar, enabling developers to write JavaScript code more easily and efficiently. In front-end interviews, you will often be asked about the new features of ES6, and the following are some of the more common:

Arrowhead functions: defining a function using the arrowhead notation (=>) simplifies the syntax of function declarations.

let and const keywords: the let and const keywords have been added to declare block-scoped variables and constants, replacing the original var keyword.

Template strings: use inverted single quotes ( ` ) to define strings, support embedding expressions and variable values in strings.

Deconstructed assignment: allows data to be extracted from an object or array and assigned to a variable, which can greatly simplify the code for data manipulation.

Promise: introduces the Promise object, which is used for asynchronous programming and dealing with callback function issues.

class and extends keywords: Allows object-oriented programming by defining classes and inheritance relationships through the class and extends keywords.

Simplifying object property declarations: For object property declarations, it is possible to use property names directly instead of key-value pairs.

For...of Loop: You can iterate through arrays, strings, and other iterative objects by using the for...of loop.

Modularity: ES6 introduces the concept of modularity, which allows code modules to be encapsulated into separate files and called between modules via import and export.

rest and spread operators: the rest operator (...) can convert the remaining arguments into an array, while the spread operator also uses three consecutive points (...) ), which can expand arrays or objects into individual values.

These are just a few of the new ES6 features that can be mastered to improve front-end development efficiency and code quality. In an interview, candidates should be familiar with and be able to explain what these features do and how to use them.