What is the easiest way to push an element to the beginning of the array

Question

I can t think of a one line way to do this   Is there a way

User · Answer

array     foo   array unshift  bar  array   gt    bar    foo     be warned  it s destructive

User · Answer

Since Ruby 2 5 0  Array ships with the prepend  method  which is just an alias for the unshift method

User · Answer

You can use insert   a    1 2 3  a insert 0  x     gt    x  1 2 3    Where the first argument is the index to insert at and the second is the value

User · Answer

What about using the unshift method      ary unshift obj         ary   Prepends objects to the front of self  moving other elements upwards    And in use   irb gt  gt  a     0  1  2    gt   0  1  2  irb gt  gt  a unshift  x     gt    x   0  1  2  irb gt  gt  a inspect   gt     x   0  1  2

User · Answer

You can use methodsolver to find Ruby functions    Here is a small script   require  methodsolver   solve   a    1 2 3   a      0      0 1 2 3      Running this prints  Found 1 methods - Array unshift   You can install methodsolver using  gem install methodsolver

User · Answer

You can also use array concatenation   a    2  3   1    a   gt   1  2  3    This creates a new array and doesn t modify the original

[arrays] What is the easiest way to push an element to the beginning of the array?

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