Appending Variables to Array Names

Hi,

I have several arrays with the same prefix, but suffixed with numbers.
I want to be able to step through these arrays in a for loop.
When I use the code below, ‘a’ + i, just evalutes to a string.
How do I get it to reference the array?

Thanks,
Robert

var a1 = [11];
var a2 = [22];
var a3 = [33];
var a4 = [44];
var a5 = [55];

for (var i = 1; i <=5; i++) {
alert( ‘a’ + i );
}

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