no-else-return 现在,我们可以使用以下no-else-return语句简化此函数,因为无论如何我们返回的都是null: let noElseReturns = (str) => { if (typeof str == "string"){ if (str.length > 1) { return str.slice(0,-1) } } return null } noElseReturns("") // => null noElseReturns("h")...
no-else-return 现在,我们可以使用以下no-else-return语句简化此函数,因为无论如何我们返回的都是null: letnoElseReturns =(str) =>{if(typeofstr =="string"){if(str.length >1) {returnstr.slice(0,-1)}}returnnull}noElseReturns("")// =...
使用if/else语句是一种在JavaScript中实现条件判断的常见方法。if/else语句允许根据条件的真假执行不同的代码块。 概念: if/else语句是一种控制流语句,用于根据条件的真假执行不同的代码块。它基于一个条件表达式,如果条件为真,则执行if代码块;如果条件为假,则执行else代码块。 分类: if/else语句是条件语句的一种...
State machines can simplify tangled paths of asynchronous code, they're easy to test, and they inherently lend themselves to helping you avoid unexpected edge-case-state pitfalls. machina aims to give you the tools you need to model state machines in JavaScript, without being too prescriptive on...
}elseif(condition2) { //block of code to be executed if the condition1 is false and condition2 is true }else{ //block of code to be executed if the condition1 is false and condition2 is false } Example If time is less than 10:00, create a "Good morning" greeting, if not, but...
In conjunction with if and else statements they make up the most important fabric of the javascript programming language. Let us take an example <!-- /* *** Example if ...else and conditional operator*** */ var d = new Date(); var time= d.getHours(); if (time <...
functionsaveCustomer(customer){if(isCustomerValid(customer)){database.save(customer)}else{alert('customer is invalid')}} 重构后代码: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 functionsaveCustomer(customer){returnisCustomerValid(customer)?database.save(customer):alert('customer is invalid')...
我们知道在 JS 中函数是尤其重要,所以使用它,我们也可以将代码拆分成一个函数对象。如下面一个改造示例 使用IF 复制 const calc = { run: function(op, n1, n2) { const result; if (op == "add") { result = n1 + n2; } else if (op == "sub" ) { ...
This JavaScript tutorial explains how to use the if-else statement with syntax and examples. In JavaScript, the if-else statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE.
The “confirm” code in the above creates a popup box which asks the boy to confirm if his homework is done. If he answers ok, then the answer is recorded as true and he gets the reward. But what happens if he says no? This is where the else part of the “if else” statement ...