// require:
const {columnName} = require('./columnName');
const {A1Notation} = require('./A1Notation');

;[
    // column name
    columnName(4),                // "D"
    columnName(27),               // "AA"
    columnName(26*26 + 26),       // "ZZ"
    columnName(26**2 + 2*26 + 3), // "ABC"
    
    // A1 notation
    A1Notation(2, 4),             // "D2"
    A1Notation(3, 27),            // "AA3"
    A1Notation(3, 26*26 + 26),    // "ZZ3"

].forEach(x => console.log(x)); 
by