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kotlin-quick-guide's Issues

Typo in section Data Types

First of all, this project is awesome, thanks for your work, I sure it will help other people to start with Kotlin.

I found a small typo in the section Data Types:

Int numbers can be added to characters, but the reverse is not true.

val ch = 'a'
val ch1 = ch + 1      // 'b'
val ch2 = 1 + ch      // Error
val ch += 2           // 'c'

The last line is syntactically incorrect:

  • You cannot create a new variable with a name already used in the same context
  • The += operator is compatible with a variable declaration, you need to remove the val keyword
  • The variable ch is immutable and it cannot be changed by +=

I think a better example could be:

var ch = 'a'
val ch1 = ch + 1      // 'b'
val ch2 = 1 + ch      // Error
ch += 2                   // 'c'

This is a small typo, but for someone who is starting to program in Kotlin it is very confusing.

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