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Check if a particular application is installed using Powershell

function check_if_installed($p1) {
    $software = $p1;
    $installed = ((gp HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*).DisplayName -Match $p1).Length -gt 0
    If (-Not $installed) {
        Write-Host "'$software'  is not installed.";
    else {
        Write-Host "'$software' is installed."
    return $installed
check_if_installed -p1 "Visual Studio Code"


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