Conditions

If statement

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

If else statement

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
}

else if statement

if (time < 10) {  
    greeting = "Good morning";  
} else if (time < 20) {  
    greeting = "Good day";  
} else {  
    greeting = "Good evening";    
}