In Ruby I can do (\'a\'..\'z\').to_a and to get [\'a\', \'b\', \'c\', \'d\', ... \'z\'].
(\'a\'..\'z\').to_a
[\'a\', \'b\', \'c\', \'d\', ... \'z\']
Do jQuery or Javascript provide a similar construc
new Array( 26 ).fill( 1 ).map( ( _, i ) => String.fromCharCode( 65 + i ) );
Use 97 instead of 65 to get the lowercase letters.