How to convert the name of an excel column to number in JavaScript

In this Article we will go through how to convert the name of an excel column to number only using single line of code in JavaScript. This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function.

Let's define this short function:

const getIndex = col => col.split('').reduce((prev, next) => prev * 26 + parseInt(next, 36) - 9, 0);

getIndex('A');      // 1
getIndex('B');      // 2
getIndex('C');      // 3
getIndex('Z');      // 26

getIndex('AA');     // 27
getIndex('AB');     // 28
getIndex('AC');     // 29
getIndex('AZ');     // 52

getIndex('AAA');    // 703
getIndex('AAB');    // 704