Why I can’t convert a String (number with decimal) into Int directly? ```fun main() { val strin...

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[Simon Lin]

Why I can’t convert a String (number with decimal) into Int directly?

fun main() {
    val stringDouble = "420.0"
    val int = stringDouble.toIntOrNull()
    assert(int != null) // failed
}

[Big Chungus]

I'm guessing to prevent rounding ambiguity.

[jbnizet]

Because the method would have too many responsibilities: what can be parsed, what cannot? Should it truncate or round? How? It's easier, more readable and more flexible to compose two functions: one that parses the string to a double or BigDecimal, and one that lets you transform this double or BigDecimal to an int, the way you want to.

[nanodeath]

agree, but also, more simply: it's not an int 🙂

[Simon Lin]

it’s not an int

stringDouble.toDouble() is also not an int. But it can call toInt()
They got same prefix (toInt*) but do different work.

[nanodeath]

sorry, I didn't follow that