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poppushunshiftshiftsplicesliceconcateverysomeforEachmapfilterreducereversesorttoStringvalueOfjoin  pop배열 뒷부분의 값을 삭제    var arr = [ 1, 2, 3, 4 ];    arr.pop();    console.log( arr ); // [ 1, 2, 3 ]        arr.pop();    console.log( arr ); // [ 1, 2 ]        arr.pop();    console.log( arr ); // [ 1 ]        arr.pop();    console.log( arr ); // []        arr.pop();    console.log( arr ); // []  pus..