Array.prototype.slice and splice
자주 안써서 햇갈릴수 있는 함수.... ^^
slice : The slice() method returns a shallow copy of a portion of an array into a new array object selected from begin to end (end not included). The original array will not be modified.
splice : The splice() method changes the contents of an array by removing existing elements and/or adding new elements
original array was modified...
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