It's the only one JavaScript currently has, though. They can even be chained: serveDrink(userIsYoungerThan4 ? 'Milk' : userIsYoungerThan21 ? 'Grape Juice' : 'Wine') īe careful, though, or you will end up with convoluted code like this: var k = a ? (b ? (c ? d : e) : (d ? e : f)) : f ? (g ? h : i) : j ġ Often called "the ternary operator," but in fact it's just a ternary operator. Like all expressions, the conditional operator can also be used as a standalone statement with side-effects, though this is unusual outside of minification: userIsYoungerThan21 ? serveGrapeJuice() : serveWine() In case of many else ifstatements, the switch statement can be preferred for readability. JavaScript will try to run all the statements in order, and will default to the else block if none of them are successful. There can be more else if blocks, the last and final else is optional. ServeDrink(userIsYoungerThan21 ? "Grape Juice" : "Wine") If it is falsy as well, it will show the last alert. This can be shortened with the ?: like so: var userType = userIsYoungerThan18 ? "Minor" : "Adult" To understand this example, you should have the knowledge of the following JavaScript programming topics: JavaScript if. In this example, you will learn to write a program to make a simple calculator in JavaScript. Here is an example of code that could be shortened with the conditional operator: var userType JavaScript Program to Make a Simple Calculator.
Then, the switch statement executes cases based on the user input.This is a one-line shorthand for an if-else statement. Como é a estrutura básica do If e Else Compartilhe. But, we can simplify this code even further by removing else if and else altogether. Título: JavaScript - IF E ELSE (Estrutura Básica) Seja Coder Descrição: A seguir você vai saber. In above program, the user is asked to enter either +, -, * or /, and two numbers. First off, If-Else is easily replaced with a switch here.
The if.else if.if statement is used to check the condition that the user has entered for the operator. The corresponding operation is performed and the output is displayed.Įxample 2: Simple Calculator with switch // program for a simple calculatorĬonst operator = prompt('Enter operator ( either +, -, * or / ): ') Ĭonst number1 = parseFloat(prompt('Enter first number: ')) Ĭonst number2 = parseFloat(prompt('Enter second number: ')) Ĭonsole.log(`$`)
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