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ConditionalKeyword.md

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ConditionalKeyword

Synopsis

Conditional Keyword Expansion

Description

Allows for conditional Keywords.

A coniditional keyword is a continue or break statement, followed by a partial if clause.

The following keywords can be used conditionally:

Keyword Example
break break if $true
continue continue if $true
return return if $true
throw throw if $true

Examples

EXAMPLE 1

Invoke-PipeScript {
    $n = 1
    do {
        $n = $n * 2
        $n
        break if (-not ($n % 16))
    } while ($true)
}

EXAMPLE 2

Import-PipeScript {
    
    function Get-Primes([ValidateRange(2,64kb)][int]$UpTo) {
        $KnownPrimes = new Collections.ArrayList @(2)
        $SieveOfEratosthenes = new Collections.Generic.Dictionary[uint32,bool]            
        $n = 2
        :nextNumber for (; $n++;) {             
            # Break if past our point of interest
            break if ($n -ge $upTo)
            # Skip if an even number
            continue if (-not ($n -band 1))
            # Check our sieve
            continue if $SieveOfEratosthenes.ContainsKey($n)
            # Determine half of the number
            $halfN = $n /2
            # If this is divisible by the known primes
            foreach ($k in $knownPrimes) {
                continue nextNumber if (($n % $k) -eq 0) {}
                break if ($k -ge $halfN)
            }                
            foreach ($k in $knownPrimes) {
                $SieveOfEratosthenes[$n * $k] = $true                
            }
            $null = $knownPrimes.Add($n)
        }
        $knownPrimes -le $UpTo
    }
}

Parameters

ContinueStatement

A Continue Statement.

Type Required Position PipelineInput
[ContinueStatementAst] true named true (ByValue)

BreakStatement

A Break Statement.

Type Required Position PipelineInput
[BreakStatementAst] true named true (ByValue)

ReturnStatement

A Return Statement.

Type Required Position PipelineInput
[ReturnStatementAst] true named true (ByValue)

ThrowStatement

A Throw Statement.

Type Required Position PipelineInput
[ThrowStatementAst] true named true (ByValue)

Syntax

ConditionalKeyword -ContinueStatement <ContinueStatementAst> [<CommonParameters>]
ConditionalKeyword -BreakStatement <BreakStatementAst> [<CommonParameters>]
ConditionalKeyword -ReturnStatement <ReturnStatementAst> [<CommonParameters>]
ConditionalKeyword -ThrowStatement <ThrowStatementAst> [<CommonParameters>]