What are es6 and es7
The full name of es6 is "ECMAScript6", which is the JavaScript language standard officially released in June 2015. It is officially called ECMAScript 2015. The full name of es7 is "ECMAScript7", which is the JavaScript language standard officially released in June 2016.
The operating environment of this tutorial: windows7 system, ECMAScript 6&&ECMAScript 7 version, Dell G3 computer.
What is es6
ECMAScript 6 (ES6 for short) is a JavaScript language officially released in June 2015 standard, officially called ECMAScript 2015 (ES2015). Its goal is to enable the JavaScript language to be used to write complex large-scale applications and become an enterprise-level development language.
What can es6 do?
ES6 is a major version upgrade. At the same time, because ES6 adheres to the design concept of maximizing compatibility with existing code, the JS code you wrote in the past will continue to run normally.
Many browsers already support some ES6 features and will continue to work on implementing the remaining features. This means that in some browsers that have implemented some features, your JS code can already run normally.
Popular MVVM frameworks such as Vue, React, Angular, etc. will be better developed with ES6. The construction tools of these frameworks also support the compilation of ES6.
The latest Node.js version already supports 99% of ES6 features, which means that it is enough for most businesses to use in projects.
What is es7
ECMAScript 7 (ES7 for short) is a JavaScript language standard officially released in June 2016. It is officially called ECMAScript 2016 (ES2016).
There are not many changes compared with the sixth version (ES6), mainly the addition of two new features: Array.prototype.include and the exponentiation operator.
1. Array.prototype.includes()
[1].includes(1); // true
2. Exponential operator
2**10; // 1024
[Related recommendations: javascript video tutorial、web front-end】
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Is async for es6 or es7?
Jan 29, 2023 pm 05:36 PM
async is es7. async and await are new additions to ES7 and are solutions for asynchronous operations; async/await can be said to be syntactic sugar for co modules and generator functions, solving js asynchronous code with clearer semantics. As the name suggests, async means "asynchronous". Async is used to declare that a function is asynchronous; there is a strict rule between async and await. Both cannot be separated from each other, and await can only be written in async functions.
How to reverse an array in ES6
Oct 26, 2022 pm 06:19 PM
In ES6, you can use the reverse() method of the array object to achieve array reversal. This method is used to reverse the order of the elements in the array, putting the last element first and the first element last. The syntax "array.reverse()". The reverse() method will modify the original array. If you do not want to modify it, you need to use it with the expansion operator "...", and the syntax is "[...array].reverse()".
Why does the mini program need to convert es6 to es5?
Nov 21, 2022 pm 06:15 PM
For browser compatibility. As a new specification for JS, ES6 adds a lot of new syntax and API. However, modern browsers do not have high support for the new features of ES6, so ES6 code needs to be converted to ES5 code. In the WeChat web developer tools, babel is used by default to convert the developer's ES6 syntax code into ES5 code that is well supported by all three terminals, helping developers solve development problems caused by different environments; only in the project Just configure and check the "ES6 to ES5" option.
How to find different items in two arrays in es6
Nov 01, 2022 pm 06:07 PM
Steps: 1. Convert the two arrays to set types respectively, with the syntax "newA=new Set(a);newB=new Set(b);"; 2. Use has() and filter() to find the difference set, with the syntax " new Set([...newA].filter(x =>!newB.has(x)))", the difference set elements will be included in a set collection and returned; 3. Use Array.from to convert the set into an array Type, syntax "Array.from(collection)".
How to implement array deduplication in es5 and es6
Jan 16, 2023 pm 05:09 PM
In es5, you can use the for statement and indexOf() function to achieve array deduplication. The syntax "for(i=0;i<array length;i++){a=newArr.indexOf(arr[i]);if(a== -1){...}}". In es6, you can use the spread operator, Array.from() and Set to remove duplication; you need to first convert the array into a Set object to remove duplication, and then use the spread operator or the Array.from() function to convert the Set object back to an array. Just group.
What does es6 temporary Zenless Zone Zero mean?
Jan 03, 2023 pm 03:56 PM
In es6, the temporary dead zone is a syntax error, which refers to the let and const commands that make the block form a closed scope. Within a code block, before a variable is declared using the let/const command, the variable is unavailable and belongs to the variable's "dead zone" before the variable is declared; this is syntactically called a "temporary dead zone". ES6 stipulates that variable promotion does not occur in temporary dead zones and let and const statements, mainly to reduce runtime errors and prevent the variable from being used before it is declared, resulting in unexpected behavior.
Is require an es6 syntax?
Oct 21, 2022 pm 04:09 PM
No, require is the modular syntax of the CommonJS specification; and the modular syntax of the es6 specification is import. require is loaded at runtime, and import is loaded at compile time; require can be written anywhere in the code, import can only be written at the top of the file and cannot be used in conditional statements or function scopes; module attributes are introduced only when require is run. Therefore, the performance is relatively low. The properties of the module introduced during import compilation have slightly higher performance.
Is es6 map ordered?
Nov 03, 2022 pm 07:05 PM
The map is ordered. The map type in ES6 is an ordered list that stores many key-value pairs. The key names and corresponding values support all data types; the equivalence of key names is determined by calling the "Objext.is()" method. Implemented, so the number 5 and the string "5" will be judged as two types, and can appear in the program as two independent keys.
