How does else if work

With the if statement, a program will execute the true code block or do nothing. For example, before noon AM and after noon PM are mutually exclusive. It is either one or the other. Fix the if statement to alert "Hello World" if x is greater than y. Start the Exercise. We just launched W3Schools videos. Get certified by completing a course today! If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:. In this case, code block 1 is executed if logical expression 1 is true; code block 2 if logical expression 1 is false and logical expression 2 is true; code block 3 if both logical expressions are false.

The else if can be used in conjunction with 'if', and 'else' to further break down the logic. Those are the basic decision orders that you have in most of the programming language; it helps you to decide the flow of actions that your program is gonna do.

The if is telling the compiler that you have a question, and the question is the condition between parenthesis. In the if case compiler check all cases Wether it is true or false. So better performance we use else if.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. What are the differences between if, else, and else if? Asked 12 years, 2 months ago. Active 4 years, 7 months ago. Viewed k times. Improve this question. Bart Zach Smith Zach Smith 5, 24 24 gold badges 76 76 silver badges bronze badges.

Use them they compromise the fundamental branch structure in most programming languages -- then you will see what they do, how they work, and what they are useful for. Add a comment. Active Oldest Votes. Improve this answer. Adam Robinson Adam Robinson k 31 31 gold badges silver badges bronze badges.

So if both condition and other condition are true, only condition's code will be executed. There are other flow control statements like "case" that can also be used for scenarios like this. Properties: constructor global ignoreCase lastIndex multiline source Methods: compile exec test toString.

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