Powershell - Looping through objects in batches of 3 - powershell

Question

I have an object which contains 7 items.
$obj.gettype().name
Object[]
$obj.length
7
I want to loop through in batches of 3. I do NOT want to use the modulus function, I actually want to be able to create a new object with just the 3 items from that batch. Pseudo code:
$j=0
$k=1
for($i=0;$i<$obj.length;$i+=3){
$j=$i+2
$myTmpObj = $obj[$i-$j] # create tmpObj which contains items 1-3, then items 4-6, then 7 etc
echo "Batch $k
foreach($item in $myTmpObj){
echo $item
}
$k++
}
Batch 1
item 1
item 2
item 3
Batch 2
item 4
item 5
item 6
Batch 3
Item 7
Regards,
ted

Answer 1

Your pseudo code is almost real. I have just changed its syntax and used the range operator (..):
# demo input (btw, also uses ..)
$obj = 1..7
$k = 1
for($i = 0; $i -lt $obj.Length; $i += 3) {
# end index
$j = $i + 2
if ($j -ge $obj.Length) {
$j = $obj.Length - 1
}
# create tmpObj which contains items 1-3, then items 4-6, then 7 etc
$myTmpObj = $obj[$i..$j]
# show batches
"Batch $k"
foreach($item in $myTmpObj) {
$item
}
$k++
}
The output looks exactly as required.

Answer 2

See if this one may work as required (I assume your item n is an element of $obj)
$obj | % {$i=0;$j=0;$batches=#{}}
if($i!=3 and $batches["Batch $j"]) { $batches["Batch $j"]+=$_; $i+=1 }
else {$i=1;$j+=1;$batches["Batch $j"]=#($_)}
} {$batches}
Should return an HashTable ($batches) with keys such as "Batch 1", "Batch 2", ... each key related to an array of three items.