Read Whole File (ARCH8086)

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Key kotlin.performance.read-whole-file · Severity info · Category performance

Flags readLines() / readText() / readBytes() on a File followed by iteration - the whole file sits in memory when useLines / buffered streaming would not.

Incorrect

file.readLines().forEach { parse(it) }

Correct

file.useLines { lines -> lines.forEach { parse(it) } }

Fix

Stream with useLines / bufferedReader().use for files that can be large.