Question Mark Anti-Patterns If you’re working withReact, you may be familiar with using the single question mark in JavaScript. This acts as the ternary operator in a ternary statement, or for optional chaining with variables. These shortcuts are handy, but they can also be signs of trouble...
So what exactly is nullish coalescing? Basically, it’s a short, simple way to provide a default value when something is null or undefined. Instead of having messy nested ternaries or logical OR statements, you can use the double question mark operator (??) to coalesce to a default. ...
The ternary operator can be visually confusing, so ? question mark and : colon always begin a line and increase the indentation by 4 spaces.return ( (the_token.id === "(string)" || the_token.id === "(number)") ? String(the_token.value) : the_token.id );...
句号 middle dot: ・ 中间点 interpunct: · 间隔号 hyphenation point: · 连字点 solidus: / 斜线 colon: : 冒号 semicolon: ; 分号 less-than sign: < 小于符号 equals sign: = 等于符号 greater-than sign: > 大于符号 question mark: ? 问号 low line: _ 下划线 digital 0: 0 数字 0 latin ...
[Js基础入门 - 掘金](https://juejin.cn/post/7244734132322992187) 浏览器执行JS简介 浏览器分成两大部分 渲染引擎和JS 引擎 渲染引擎: 用来解析HTML与CSS,俗称内核,比如chrome浏览器的blink,老版本的webkit JS 引擎:也称
"Parameter cannot have question mark and initializer.": "参数不能包含问号和初始值设定项。", "A required parameter cannot follow an optional parameter.": "必选参数不能位于可选参数后。", "An index signature cannot have a rest parameter.": "索引签名不能包含 rest 参数。", "An index signature...
Theternary operatoris very similar to anif/elsestatement. If the expression to the left of the question mark is truthy, the operator returns the value to the left of the colon, otherwise, the value to the right of the colon is returned. ...
FastExport supports question-mark parameter markers in WHERE clause conditions. However, the database does not permit the equal = operator for primary or unique secondary indexes, and will return database error 3695 "A Single AMP Select statement has been issued in FastExport". Do not use FastExp...
import { mapGetters } from 'vuex' export default { computed: { // mix the getters into computed with object spread operator ...mapGetters([ 'completedTodos', 'todosCount', // ... ]) } }What are mutations? Vuex mutations are similar to any events with a string type and a handler. ...
Mark 一下，下班答 题主应该看到的是 transform 后的代码，正常的代码中很少有这样的写法。其实想来也...