英文| https://betterprogramming.pub/5-ways-to-refactor-if-else-statements-in-javascript-functions-2865a4bbfe29 翻译| 小爱 在本文中,我将介绍5种通过不必要的if-else语句来整理代码的方法。我将讨论默认参数,或(||)运算符,空位合并,可选链no-e...
The if/else statement is a part of JavaScript's "Conditional" Statements, which are used to perform different actions based on different conditions. In JavaScript we have the following conditional statements: Useifto specify a block of code to be executed, if a specified condition is true ...
noElseReturns("hello!") // => "hello" 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 该no-else-return语句的好处是,如果不满足条件,该函数将结束的执行if-else并跳至下一行。你甚至可以不使用最后一行(return null),然后返回undefined。 注意:我实际上在前面的示例中使用了一个no-else-return函数。
if( condition ) {//statement}else{//statement (whencondition evaluates tofalse)} 以下流程图说明了 if else 语句。 请参阅以下示例: letx =5;if(x >10) {console.log('x is greater than 10');}else{console.log('x ...
JavaScript if else 语句简介 if 语句可能是 JavaScript 中最常用的语句之一。if 语句在满足条件时执行语句或代码块。下面是 if 语句的简单形式: if( condition ) statement; 1. 2. 条件可以是任何有效的表达式。通常,条件计算为布尔值,真值或假值。
In JavaScript we have the following conditional statements:Use if to specify a block of code to be executed, if a specified condition is true Use else to specify a block of code to be executed, if the same condition is false Use else if to specify a new condition to test, if the ...
If its good weather we’re going to the beach today, else if it’s raining we’re staying home. In fact, we based most of our choices on if then else statements. So it’s no wonder programmers rely on conditional statement to write logical useful code. Actually, I would say that con...
The error here is caused due to the else statement, which has no preceding if. Henceforth, always make sure that each and every else that you use has a preceding if. The switch statement Apart from the if...else statements, there is another conditional statement in JavaScript called switch...
In the above example, the if statement checks for the condition age >= 18.Since we set the value of age to 17, the condition evaluates to false.Thus, the code inside if is skipped. And, code inside else is executed.When can we omit { } in if…else statements? We can omit { }...
JavaScript Else If is a type of conditional statement that is used to compare different decisions. Conditional statements let you perform different actions based on varying conditions.JavaScript supports two types of conditional statementsnamely if..else..if and switch. In this tutorial, we will disc...