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Majirefy/KotlinNullSafeTypes.kt

Created March 19, 2017 15:46
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KotlinNullSafeTypes.kt
var str: String = "example"
str = null // compilation error, str can not hold null
var b: String? = "example"
b = null // OK, b can hold null
println(a?.substring(0,4)) // prints "exam"
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