unshift is like push just from the lower side, kind of inverted shift
a little perldebugger demo
DB<9> x @a =(5)
0 5
DB<10> unshift @a,4
DB<11> x @a
0 4
1 5
DB<12> unshift @a,1,2,3
DB<13> x @a
0 1
1 2
2 3
3 4
4 5
DB<14> push @a, 6
DB<15> x @a
0 1
1 2
2 3
3 4
4 5
5 6
DB<16> p shift @a
1
DB<17> x @a
0 2
1 3
2 4
3 5
4 6
DB<18> p pop @a
6
DB<19> x @a
0 2
1 3
2 4
3 5
DB<20>
I recommend trying perl -de0 to play around by yourself
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