JavaScript skips any remaining conditionals after it runs the first one that passes.Īn else if statement doesn’t need a following else statement to work. You can use multiple if else conditionals, but note that only the first else if block runs. If (bmi = 18.5 & bmi = 25 & bmi <= 29.You can also extend an if statement with an else if statement, which adds another conditional with its own block.
It uses the if.else.if statement to determine the weight status based on the BMI: let weight = 70 // kg let height = 1.72 // meter // calculate the body mass index (BMI) let bmi = weight / (height * height) The following example calculates a body mass index (BMI) of a person. 2) Using JavaScript if…else…if statement to calculate the body mass index If you change the month to a number that is not between 1 and 12, you’ll see the Invalid Month in the console because the else clause will execute. Therefore, the if.else.if statement assigns the literal string 'Jun' to the monthName variable. Learn if, else if, else and the ternary statements to control the flow of a Javascript application conditionally. Since the month is 6, the expression month=6 evaluates to true. In this example, we compare the month with 12 numbers from 1 to 12 and assign the corresponding month name to the monthName variable.
#JAVA SCRIPT IF ELSE IF CODE#
The following example uses the if.else.if statement to get the month name from a month number: let month = 6 Ĭonsole.log(monthName) Code language: JavaScript ( javascript )
1) A simple JavaScript if…else…if statement example If else statements allows you to execute different blocks of code depending on whether a condition is true or false. The two most common condition statements in JavaScript are if/else and such cases. Let’s take some examples of using the if.else.if statement. In JavaScript conditions statements are allowed to perform different actions based on different conditions. The following flowchart illustrates how the if.else.if statement works: If all the conditions are false, the if.else.if statement executes the block in the else branch. The else if statement allows for more than two possible outcomes. For example, if the condition2 is true, the if.else.if statement won’t evaluate the condition3. The if.else.if statement stops evaluating the remaining conditions as soon as a condition is true. The if.else.if statement checks the conditions from top to bottom and executes the corresponding block if the condition is true. In theory, you can have as many conditions as you want to, where each else.if branch has a condition. In this syntax, the if.else.if statement has three conditions. To check multiple conditions and execute the corresponding block if a condition is true, you use the if.else.if statement like this: if (condition1) Code language: JavaScript ( javascript ) The if an if…else statements accept a single condition and execute the if or else block accordingly based on the condition. Introduction to the JavaScript if else if statement If the condition is falsy, another statement in the optional else clause will be executed.
#JAVA SCRIPT IF ELSE IF HOW TO#
Summary: In this tutorial, you will learn how to use the JavaScript if.else.if statement to check multiple conditions and execute the corresponding block if a condition is true. The if.else statement executes a statement if a specified condition is truthy.
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