12/31/2023 0 Comments Java script if else ifThen we will define an else block to execute a statement in case the condition returns false.The execution of if() block will depend on whether the condition is true or false. Once the condition is defined, place the condition inside if() statement.Place the condition inside if() Statement it can be the comparison of two operands using comparison operators or a simple boolean variable. The conditional could be any statement that would return a true or false value. First of all, we need to define a condition.In order to use an if-else statement, we need to follow a set of steps: Define a condition. This is so because of their property of executing a certain process only if a certain condition is satisfied. If else statements are also known as conditional statements. This is one of the many examples where the if-else statement comes in handy. If the password matches, it will proceed to open your account, else it will prompt that the password is wrong. Now imagine it has found your username, and now it is matching the user-entered password with the one in its database ( note: it would start matching the password only if the first condition is true otherwise, it will execute the else block). When you log into a social media site, it asks for your username and password, and then it matches both with the ones stored in its database. Because of this behavior, the if else statement is also known as the conditional statement.įor e.g. In such cases, an if else statement comes handy. In programming, we often encounter situations where we are given two (or more) choices, and we have to proceed with one. Remember those autumn mornings during school time? Heavy rains and you have to decide whether you're going to school or not? Well, the usual answer used to be If it stops raining, then I'll go the school otherwise, I won't. The if else statement can be nested or chained using multiple conditions. The else statement is not mandatory and will execute only if the if condition fails. The if else statement can be used in situations where we have to make decisions depending on the existence of a particular condition. These decisions are made if the pre-stated conditions are either true or false, depending on the functions the programmer has in mind. It's the only one JavaScript currently has, though.Conditional statements are used through the various programming languages to instruct the computer on the decision to make when given some conditions. 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() ServeDrink(userIsYoungerThan21 ? "Grape Juice" : "Wine") This can be shortened with the ?: like so: var userType = userIsYoungerThan18 ? "Minor" : "Adult" Here is an example of code that could be shortened with the conditional operator: var userType This is a one-line shorthand for an if-else statement.
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