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Declaring Variables
var name: String = "Bob" or var name = "Bob"
var age:Int = 23 or var age = 23
Data type in kotlin is optional. Kotlin infers data type itself according to value assigned to it unlike java.
Val is immutable. Once the value of val is assigned it can not be altered later. It is the same as the final keyword in java. It will be inferred in runtime. We don't have to assign a value at compile time.
val salary = 1000
const val LANGUAGE="en"
If you have the value of type string or primitive data which is known at compile time then you can declare as const. const can be declared at the top of the file or inside object declaration.
- Top of the file Util.kt
const val locale = "en"
- Inside Object declaration
object Utils{
const val locale = "en"
}lowerCamelCase
example
priceRange, profileCount, personalInformation
In general, identifiers may consist of letters, digits, and underscores, and may not begin with a digit.
Use all capital letters for constant
const val MAX_PER_COUNT=100
“Any fool can write code that a computer can understand. Good programmers write code that humans can understand.” - Martin Fowler
The code should tell the story while going through it. It should be like good poetry or story which is easily relatable by the user.
The variable naming convention is wholly dependent upon many factors like a programming language, programmer's native language, limitations in hardware, software, and time constraints.
| Description | Don't | Do's |
|---|---|---|
| Use Intention Revealing names | var d:Int | var elapsedTimeInDays:Int |
| Use pronounceable names | var genymdhms:Date var modymdhms:Date |
var generationTimestamp:Date var modificationTimestamp:Date |
| Use searchable names | sum = (item*4)/5 | const val WORK_DAYS_PER_WEEK = 5 val realDaysPerIdealDay = 4 sum = (item * realDaysPerIdealDay)/ WORK_DAYS_PER_WEEK |