July 2018
Intermediate to advanced
400 pages
12h 14m
English
Content preview from Kotlin Programming: The Big Nerd Ranch Guide, First Edition
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Extensions in the Kotlin Standard Library
A large portion of the Kotlin standard library’s functionality is defined via extension functions and extension properties.
For example, take a look at the source code file Strings.kt (note: Strings, not String), by pressing the Shift key twice to open the Search Everywhere dialog and entering “Strings.kt”:
public inline fun CharSequence.trim(predicate: (Char) -> Boolean): CharSequence { var startIndex = 0 var endIndex = length - 1 var startFound = false while (startIndex <= endIndex) { val index = if (!startFound) startIndex else endIndex val match = predicate(this[index]) if (!startFound) { if (!match) startFound = true else startIndex += 1 } else { if (!match) break else endIndex -= 1 ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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