I am getting error for this syntax
for (i in 0 until 8) {
for (j in 0 until 8) {
} println()
}
error is
For is not an expression, and only expressions are allowed here.
but this is valid
for (i in 0 until 8) {
for (j in 0 until 8) {
}
println()
}
only thing I changed was where println() is called, I have worked with java so I thought that placement should not matter. What is the issue here ?
I did some testing in Kotlin Playground. Kotlin compiler indeed cannot parse statements that are placed on the same line and not divided by ;.
For example 10 println("")
will produce an error: "Unresolved reference: println".
Note that 10 actually is an expression, since expressions are code blocks that produce single value.
The guessing is below:
The real question is, why Kotlin compiler shows the specific error, which is
For is not an expression, and only expressions are allowed here
I believe that has something to do with the Kotlin compiler's code parse algorithm. That seems like compiler tries to parse multiple statements on the same line as a single expression. for keyword makes it fail right away. However, if you replace for loop with a real expression, compiler will highlight the println call as something wrong, since it is something excess for an expression.
println()is on its own line, despite the fact you can make the first approach work with a semicolon. The second approach is more idiomatic and thus more readable.