![]() Moreover, we also learned to use it and combine it with elseand else ifto check for more complex conditions. In this write-up, we discussed what is an ifstatement. The ifstatements can be used in different forms depending upon the complexity of the condition. In computing, ifa decision-making/conditional statement is used to run a block of code if a particular condition is satisfied. Switch statements can be used as an alternative to if-else statements, but they can only check for equality, while the if-else statements can have a range of values as a condition. Although the syntax varies from language to language. The editor does not check the else statement as one of the conditions is already true. The ifthen construct (sometimes called ifthenelse ) is common across many programming languages. As the number is equal to 10, this statement is true, and the body of the else-if statement is executed. ![]() ![]() So the editor moves on to the else-ifcondition. In the example given above, the number is equal to 10. log ( 'The number is greater than ten.' ) log ( 'The number is equal to ten.' )Ĭonsole. log ( 'The number is less than ten.' )Ĭonsole. Further, having many global variables will slow down your program since they are not deleted until the window is closed, whereas local variables are deleted once the function is completed.Console. Global variables should still be avoided, as they can accidentally overwrite window variables resulting in errors. If there are a local variable and a global variable with the same name, JavaScript will prioritize the local variable and ignore the global variable. Local variables are only visible within the function it is defined. Global variables can be defined anywhere in the program and exist outside of functions. These scopes decide where in your code these variables are defined or can be accessed. In JavaScript, variables have a scope in which they can be used, either global or local. Putting one if statement inside another if statement is called nesting. No explicit conversion is needed for the other operations since JavaScript automatically converts them to numbers if the input string is composed only of. See the Pen javascript-common-editor by w3resource ( on CodePen. with following condition : Ī+ (marks>=90) : A (marks>=80 and marks=70 and marks=60 ![]() To kick your JavaScript skills into outer space, everything you see here and. Here the if else statement check whether the input marks is greater than 50 or not.Ĭonsole.log('Marks is greater than 50.') Ĭonsole.log('Marks is less than or equal to 50.') The if, else, and switch keywords form the bulk of what helps your code. In the following example if else statement check whether an input marks is greater than 50 or not. Use the optional else clause to execute another group of statements. What is if else statement in JavaScript The if-else statement is used to execute a block of code based on a condition. There are two conditional statements in JavaScript : if.else and switch.Įxecutes a group of statements if a logical condition is true. A conditional statement is a set of commands and the commands execute if a specified condition is true.
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