Conditionals

Lecture 132:- Conditionals

In JavaScript, conditionals are used to execute a block of code if a specific condition is met. The two most commonly used conditional statements are "if" and "else".

The syntax for an "if" statement is as follows:

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if (condition) {   // block of code to be executed if the condition is true }

If the condition specified in the parentheses evaluates to true, the block of code within the curly braces will be executed. If the condition is false, the code within the braces will be skipped over and the program will continue executing the next line of code after the closing brace.

An "else" statement can be used in conjunction with an "if" statement to execute a block of code if the condition is false. The syntax for an "if/else" statement is as follows:

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if (condition) {   // block of code to be executed if the condition is true } else {   // block of code to be executed if the condition is false }

If the condition in the "if" statement is true, the code within the first set of curly braces will be executed. If the condition is false, the code within the second set of braces after the "else" keyword will be executed.

Multiple "else if" statements can also be used to check for additional conditions, like this:

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if (condition1) {   // block of code to be executed if condition1 is true } else if (condition2) {   // block of code to be executed if condition2 is true } else if (condition3) {   // block of code to be executed if condition3 is true } else {   // block of code to be executed if none of the conditions are true }

This allows for a more complex series of conditions to be checked in sequence, with the code within the first matching condition being executed. If none of the conditions evaluate to true, the code within the final "else" block will be executed.