25 lines
607 B
Kotlin
25 lines
607 B
Kotlin
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import java.time.Instant
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fun main() {
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// Check if a is in abc
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println('a' in "abc")
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// Check if a is not in abc
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println('a' !in "abc")
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// Check if now is within the bounds, using comparable under the hood
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println(Instant.now() in Instant.MIN..Instant.MAX)
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}
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/// Playground
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fun isValidIdentifier(s: String): Boolean {
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fun isValidCharacter(ch: Char): Boolean = ch == '_' || ch.isLetterOrDigit()
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if (s.isEmpty() || s[0].isDigit()) {
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return false
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}
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for (ch in s) {
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if (!isValidCharacter(ch)) {
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return false
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}
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}
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return true
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}
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