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- ### array operation : pop, push, shift, unshift, slice, splice
- ```nodejs
- > a=[1,2,3,4,5,6,7]
- [ 1, 2, 3, 4, 5, 6, 7 ]
- > a.pop()
- 7
- > a
- [ 1, 2, 3, 4, 5, 6 ]
- > a.shift()
- 1
- > a
- [ 2, 3, 4, 5, 6 ]
- > a.unshift(1)
- 6
- > a
- [ 1, 2, 3, 4, 5, 6 ]
- > a.push(7)
- 7
- > a
- [ 1, 2, 3, 4, 5, 6, 7 ]
- > a.slice(2,4)
- [ 3, 4 ]
- > a
- [ 1, 2, 3, 4, 5, 6, 7 ]
- > a.splice(2,4)
- [ 3, 4, 5, 6 ]
- > a
- [ 1, 2, 7 ]
- > a.splice(2,0,[3,4,5,6])
- []
- > a
- [ 1, 2, [ 3, 4, 5, 6 ], 7 ]
- > a.splice(2,1)
- [ [ 3, 4, 5, 6 ] ]
- > a
- [ 1, 2, 7 ]
- > a.splice(2,0,3)
- []
- > a
- [ 1, 2, 3, 7 ]
- > a.splice(3,0,4)
- []
- > a
- [ 1, 2, 3, 4, 7 ]
- >
- ```
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