How do I perform foreach loop inside <script> tag ? note its not <script type="text/javascript">

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var a = [];
var b=[];
@foreach (var filename in Model.File)
{
    @:a.push('@filename');
}
@foreach (var errortext in Model.Error)
{
    @:b.push('@errortext');
}

The above gives me :

a[0]="File1";
a[1]="File2";
b[0]= "Unable to open report attachment [iRefpdfFile.PDF]. This will not adversely affect the submission of this file online in any way. Error: Cannot handle iref streams. This PDF will need to be resaved in an Acrobat 5 compatable manner or with the original save options changed so that it does not to use this feature."
b[1]="This is a demo error message."

The sequence of filename and error is maintained that is b[0] is a[0]'s error message.
But i want to display alert for every file and its consequtive error message. How do i do that ?

What I have tried:

I tried to perform @foreach loop but that doesnt allow me to use alert keyword or any javascript method .
Note the code is inside <script> tag and not inside <script type="text/javascript">