1. T his Story is from the Kotlin- Series, In which we will learn What is the actual difference between val and var. Basically, val and var both are used to declare a variable. var is like a
Both val and var are used to declare variables. var is like general variable and it's known as a mutable variable in Kotlin and can be assigned multiple times. val is like final variable and it's known as immutable in Kotlin and can be initialized only single time.
What is the "real" difference between the following ? val b = ( x:Double) => x * 3 var b = ( x:Double) => x * 3 Technically speaking, once a value is assigned to val, it should not be changed. However, as part of the first statement, the value of b could be changed to different values by passing different values of x.
A constant is used to hold the fixed values which we can retrieve later but cannot change. A variable is used to hold some value that can be changed according to the requirement. The constants are generally stored in the text segment as they are read-only. The variables are stored inside a data segment, heap, or stack depending on the
3 Answers. since arrays in swift are structs declaring an array with let not only prevents you from assigning a new value to it but also prevents you from changing its contents. let arr = [0, 1, 2] arr [0] = 10 //will not compile arr = [] //will not compile. Thank you, all answers are good and useful but in my opinion yours is more complete.
In choosing between the two passing mechanisms, the most important criterion is the exposure of calling variables to change. The advantage of passing an argument ByRef is that the procedure can return a value to the calling code through that argument. The advantage of passing an argument ByVal is that it protects a variable from being changed
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difference between var and val
