PowerShell

Call a JavaScript Function Returning a Boolean

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Demonstrates how to call a JavaScript function that returns a boolean. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

# This is the JavaScript function we'll call:

# function isEven(number) {
#     return number % 2 === 0;
# }

$sbScript = New-Object Chilkat.StringBuilder
$sbScript.Append("function isEven(number) { return number % 2 === 0; }")

$js = New-Object Chilkat.Js

$result = New-Object Chilkat.JsonObject
$result.EmitCompact = $false

# Call Eval to add the function to the context's global object
$success = $js.Eval($sbScript,$result)
if ($success -eq $false) {
    # Examine the result for an exception.
    $($result.Emit())

    # Also examine the LastErrorText.
    $($js.LastErrorText)
    exit
}

# ------------------------------------------------------------------------------
# Call the function isEven(8)

$funcCall = New-Object Chilkat.JsonObject

# Create JSON specifying the function name and arguments

# {
#   "name": "isEven",
#   "args": [ 8 ]
# }

$funcCall.UpdateString("name","isEven")
$funcCall.UpdateInt("args[0]",8)

$success = $js.CallFunction($funcCall,$result)
if ($success -eq $false) {
    # Examine the result for an exception.
    $($result.Emit())

    # Also examine the LastErrorText.
    $($js.LastErrorText)
    exit
}

$($result.Emit())

# Output:
# {
#   "type": "bool",
#   "value": true
# }

$retval = $result.BoolOf("value")
$($retval)

# Output:
# $true