how can i combine 1D array of numeric and 1D array of string

I have 1D array of numeric numbers (COLUMN)

and

1D array of string (COLUMN)

I want these two 1D columns to come next to each other and become 2D array.

1st column               2nd column

A                                1.2

B                                1.01

C                                  2

D                                   8

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