Question

例如，如果我要检查arr1（3个数组的数组）是否包含arr2（2个数组的数组）的任何元素，则可以使用.some()函数，但返回false。

let arr1 = [[1, 2], [2, 3], [3, 4]]
let arr2 = [[1, 2], [5, 2],]

if (arr1.some(x => arr2.includes(x))) {
    alert('arr1 has arr2')
};

x确实返回数组[1，2]，但是由于某种原因，它没有通过arr1中的.some（）检查。

Answer 1

如果传递的项目是数组中的foreach，则

[regex]将返回[regex]，但是在JS中，除非创建了一个独立的对象，否则它们彼此之间永远不会switch -regex从另一个参考：

# Sample file content (6 lines)
$fileContent = @'
TITLE %TIME%   NO "%zmyapps1%\*.*" ARCHIVE ATTRIBUTE   LINE2 1243
TITLE %TIME%   DOC/SET YQJ8   LINE2 1887
SET ztitle=%TIME%: WINFOLD   LINE2 2557
TITLE %TIME%   _*.* IN WINFOLD   LINE2 2597
TITLE %TIME%   %%ZDATE1%% YQJ25   LINE2 3672
TITLE %TIME%   FINISHED. PRESS ANY KEY TO SHUTDOWN ... LINE2 4922

'@

# Determine the full path to a sample file.
# NOTE: Using the *full* path is a *must* when calling .NET methods, because
#       the latter generally don't see the same working dir. as PowerShell.
$file = "$PWD/test.bat"

# Note: input is the number of 6-line blocks to write to the sample file,
#       which amounts to 600 vs. 3,000 vs. 30,0000 lines.
100, 500, 5000 | % { 

  # Create the sample file with the sample content repeated N times.
  $repeatCount = $_ 
  [IO.File]::WriteAllText($file, $fileContent * $repeatCount)

  # Warm up the file cache and count the lines.
  $lineCount = [IO.File]::ReadAllLines($file).Count

  # Define the commands to compare as an array of scriptblocks.
  $commands =
    { # switch -Regex -File with regex string literal
      & { 
        $i = 0
        $updatedLines = switch -Regex -File $file {
          '^(.*? (?:AROUND LINE|LINE2) )\d+(.*)$' { $Matches[1] + ++$i + $Matches[2] }
          default { ++$i; $_ }
        } 
        [IO.File]::WriteAllLines($file, $updatedLines, [text.encoding]::ASCII)
      }
    }, { # switch -Regex -File with precompiled regex
      & {
        $i = 0
        $regex = [Regex]::new('^(.*? (?:AROUND LINE|LINE2) )\d+(.*)$', 'Compiled, IgnoreCase, CultureInvariant')
        $updatedLines = switch -Regex -File $file {
          $regex { $Matches[1] + ++$i + $Matches[2] }
          default { ++$i; $_ }
        } 
        [IO.File]::WriteAllLines($file, $updatedLines, [text.encoding]::ASCII)
      }
    }, { # foreach with precompiled regex and [regex].Match
      & {
        $regex = [Regex]::new('^(.*? (?:AROUND LINE|LINE2) )\d+(.*)$', 'Compiled, IgnoreCase, CultureInvariant')
        $i = 0
        $updatedLines = foreach ($line in [IO.File]::ReadLines($file)) {
            $i++
            $m = $regex.Match($line)
            if ($m.Success) {
                $g = $m.Groups
                $g[1].Value + $i + $g[2].Value
            } else { $line }
        }
        [IO.File]::WriteAllLines($file, $updatedLines, [Text.Encoding]::ASCII)    
      }
    }

  # How many runs to average.
  $runs = 100

  Write-Verbose -vb "Averaging $runs runs with a $lineCount-line file of size $('{0:N2} MB' -f ((Get-Item $file).Length / 1mb))..."

  Time-Command -Count $runs -ScriptBlock $commands | Out-Host

}

。我想一种方法是先对子数组进行字符串化：

.includes

Answer 2

我认为include函数不适用于2维数组
请更改这样的代码

let arr1 = [[1, 2], [2, 3], [3, 4]]
let arr2 = [[1, 2], [5, 2],]
if (arr1.some(x => {
    return arr2.some(item => item.toString() === x.toString())
})) {
    alert('arr1 has arr2')
};

Answer 3

您可以lodash _.isEqual中的一个来比较数组。

let arr1 = [[1, 2], [2, 3], [3, 4]]
let arr2 = [[1, 2], [5, 2]]

if (arr1.some(x => {
    return arr2.some(item => _.isEqual(item, x))
})) {
    console.log('arr1 has arr2')
};

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

.some（）函数不适用于嵌套数组？

3 个答案: