mapNotNullTo

val dw = mutableListOf<Int>()
val data = arrayOf("one", null, "three", "four", null)
// 将非空字符串转换为其长度, 非空字符串长度: [3, 5, 4]
data.mapNotNullTo(dw) {
    it?.count()
}.forEach {
    _console.log(it)
}

def dw = $objectWrappers.wrap($iterables.mutableListOf())
def data = $objectWrappers.wrap($arrays.arrayOf($plugins.loadClass("java.lang.String"), "one", null, "three", "four", null))
// 将非空字符串转换为其长度, 非空字符串长度: [3, 5, 4]
data.mapNotNullTo(dw) {
    if (it != null) {
        $objectWrappers.wrap(it).count()
    }
}.forEach {
    $console.log(it)
}

let dw = $objectWrappers.wrap($iterables.mutableListOf())
let data = $objectWrappers.wrap($arrays.arrayOf($plugins.loadClass("java.lang.String"), "one", null, "three", "four", null))
// 将非空字符串转换为其长度, 非空字符串长度: [3, 5, 4]
data.mapNotNullTo(dw, it => {
    if (it != null) {
        return $objectWrappers.wrap(it).count()
    } else {
        return null
    }
}).forEach((it) => {
    $console.log(it)
})

local dw = _objectWrappers:wrap(_iterables:mutableListOf())
local data = _objectWrappers:wrap(_arrays:arrayOf(_plugins:loadClass("java.lang.String"), "one", nil, "three", "four", nil))
-- 将非空字符串转换为其长度, 非空字符串长度: [3, 5, 4]
data:mapNotNullTo(dw, function(it)
    if (it ~= nil) then
        return _objectWrappers:wrap(it):count()
    else
        return nil
    end

end):forEach(function(it)
    _console:log(it)
end)

<?php
$dw = $objectWrappers->wrap($iterables->mutableListOf());
$data = $objectWrappers->wrap($arrays->arrayOf($plugins->loadClass("java.lang.String"), "one", null, "three", "four", null));
// 将非空字符串转换为其长度, 非空字符串长度: [3, 5, 4]
$data->mapNotNullTo($dw, function ($it) use ($objectWrappers) {
    if ($it != null) return $objectWrappers->wrap($it)->count(); else return null;
})->forEach(function ($it) use ($console) {
    $console->log($it);
});

dw = _objectWrappers.wrap(_iterables.mutableListOf())
data = _objectWrappers.wrap(_arrays.arrayOf(_plugins.loadClass("java.lang.String"), "one", None, "three", "four", None))
# 将非空字符串转换为其长度, 非空字符串长度: [3, 5, 4]
data.mapNotNullTo(dw, lambda it: _objectWrappers.wrap(it).count() if it != None else None).forEach(
    lambda it: _console.log(it))

# encoding: utf-8
dw = $objectWrappers.wrap($iterables.mutableListOf())
data = $objectWrappers.wrap($arrays.arrayOf($plugins.loadClass("java.lang.String"), "one", nil, "three", "four", nil))
# 将非空字符串转换为其长度, 非空字符串长度: [3, 5, 4]
data.mapNotNullTo(dw) { |it|
  if it != nil then
    $objectWrappers.wrap(it).count()
  else
    nil
  end
}.forEach { |it|
  $console.log(it)
}

Last modified: 09 September 2025