Kotlin メモ : forEachIndexed

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/for-each-indexed.html


Java

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1. int pos = 1;  
2. for (Item item : items) {  
3.     log(pos, item);  
4.     pos++;  
5. }  

int pos = 1; for (Item item : items) { log(pos, item); pos++; } Kotlin 変換直後

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1. var pos = 1  
2. for (item in items) {  
3.     log(pos, item)  
4.     pos++  
5. }  

var pos = 1 for (item in items) { log(pos, item) pos++ } forEachIndexed 使用

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1. items.forEachIndexed { index, item -> log(index + 1, item)}  

items.forEachIndexed { index, item -> log(index + 1, item)}