felixchez

/**
 * Convert from units to another units e.g. from square feet to acres
 * return original value if conversion units are not supported
 * Usage:
 *   const convertedValue = convert(100).from('acres').to('square feet');
 * expected: 
 *   4356000
 */
class Converter {
  private toUnits: string;

felixchez

inline fun benchmark(block: () -> Unit): Unit {
  val startTime = System.nanoTime()
  block()
  val endTime = System.nanoTime()
  Log.i("Time take to execute in ${endTime - startTime)")
}

===
fun onClickHandler() {
   // onClickListener flows that handling Network Request, Database Persistence and UI Rendering

felixchez

val startTime = System.nanoTime()
// onClickListener flows that handling Network Request, Database Persistence and UI Rendering
val endTime = System.nanoTime()
Log.i("Time take to execute in ${endTime - startTime)")

felixchez

fun doAsyncOperation(val onCallback: (String) -> Unit?) {
  // do lengthy computation operation
  onCallback("result")
}

===
doAsyncOperation { _ ->  }
doAsyncOperation {result -> Log.v(result)}

felixchez

fun doAsyncOperation(val onCallback: ((String) -> Unit)? = null) {
  // do lengthy computation operation
  onCallback?.invoke("result")
}

===
doAsyncOperation()
doAsyncOperation {result -> Log.v(result)}

felixchez

val dataTypeA = arrayListOf(1, 2, 3)
Observable.fromIterable(dataTypeA)
  .map {element -> when (element) {
        1 -> "one"
        2 -> "two"
        3 -> "three"
        else -> ""
    }}
  .toList().toObservable()