An Array ( []) is a kind of Object ( {} ). The key differences are: Arrays have a magic length property that is equal to the highest-set numeric key (plus one): var a = []; a [100] = 0; a.length; // is 101 var o = {}; o [100] = 0; o.length; // is undefined. An Array's toString method prints out the values of numeric keys:
The difference between var and val in extension properties is that while writing extension property if you use val you can only use get because you can not set value to it as it is immutable constant variable you can not use set () in val extension property. For Example. val String.extensionProperty get () = "Value".
let works very much like var. The main difference is that the scope of a var variable is the entire enclosing function. This table on Wikipedia shows which browsers support Javascript 1.7. Note that only Mozilla and Chrome browsers support it. IE, Safari, and potentially others don't.
To val, or to const val, that is the question. When starting to learn Kotlin, one of the main observable differences compared to Java is that every variable/value definition comes first with any of these three keywords: var, val or const val. It is pretty clear that var allows mutation while val defines immutability.
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| О ςաсах | Эшዚ экрυ |
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To read more, check data-classes. About the result, Technically, you are getting is different because of implementation of toString () method. data class' toString () method uses data class properties and values to form returning string. General class' toString () method uses hash code to form returning string. Share.
1. A property is just some value associated with an object: class MyClass { var someProperty: String = "wow" } If it's a val it's read-only and can't be changed. If it's a var then you can set a different value on that property later. You can initialise properties based on parameters passed into the constructor: class Rectangle (width: Int
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difference between var and val
