Page 137 - KEC Khaitan C5 Flipbook
P. 137
CONDITIONAL STATEMENTS (IF-ELSE)
Conditional statements allow programs to make decisions based on conditions. The if
statement checks whether a condition is true and then executes code accordingly. The if-
else statement is used to control what happens depending on user input or calculations. It
executes one block if true, and another if false.
Example: To check the voting eligibility.
var age = 16;
if (age >= 18) {
setText("outputLabel", "You can vote.");
} else {
setText("outputLabel", "You cannot vote yet.");
}
BOOLEAN LOGIC
Boolean logic deals with true/false values and is used in if-else statements for decision-
making. In App Lab, you can use Boolean operators (&&, ||, !) to make your program
smarter.. Some common comparison operators include:
Operator Description Example
== Equal to x == 5
!= Not equal to x != 10
> Greater than score > 50
< Less than age < 18
>= Greater than or equal to points >= 100
<= Less than or equal to level <= 10
Boolean operators such as AND (&&), OR (||), and NOT (!) are used to combine multiple
conditions to make your program smarter.
Example: To check it's raining or not.
onEvent("checkWeatherButton", "click", function() {
var isRaining = true;
Working with Variables and Conditional Logic 135

