Ruby What is the easiest way to remove the first element from an array

Question

Lets say I have an array    0  132  432  342  234    What is the easiest way to get rid of the first element   0

User · Accepted Answer

pop ing the first element of an Array is called  shift    unshift  being the operation of adding one element in front of the array

User · Answer

0  132  432  342  234  1  -1    gt   132  432  342  234    So unlike shift or slice this returns the modified array  useful for one liners

User · Answer

Use shift method  array shift n    gt  Remove first n elements from array  array shift 1    gt  Remove first element   https   ruby-doc org core-2 2 0 Array html method-i-shift

User · Answer

You can use   a slice  0    slice  generalizes to any index or range

User · Answer

You can use  arr -  arr 0    or arr -  arr shift   or simply arr shift 1

User · Answer

You can use     a delete a 0       a delete at 0   Both can work

User · Answer

This is pretty neat   head   tail    1  2  3  4  5      gt  head   1  tail    2  3  4  5    As written in the comments  there s an advantage of not mutating the original list

User · Answer

Use the shift method on array   gt  gt  x    4 5 6    gt   4  5  6                                                               gt  gt  x shift    gt  4  gt  gt  x                                                                       gt   5  6     If you want to remove n starting elements you can use x shift n

User · Answer

You can use Array delete at 0  method which will delete first element    x    2 3 4 11 0   x delete at 0  unless x empty     3 4 11 0

User · Answer

or a delete at 0

User · Answer

a    0 1 2 3   a drop 1      gt   1  2  3    a     gt   0 1 2 3    and additionally    0 1 2 3  drop 2    gt   2  3    0 1 2 3  drop 3    gt   3

[ruby-on-rails] Ruby: What is the easiest way to remove the first element from an array?

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