Generate 1099 random english letters without custom functions in Javascript

Works only in Chrome/Nodejs. Safari and Firefox will give you only 17 characters. :)

Math.random()
 .toString(9)
 .slice(2)
 .split('')
 .map(Number)
 .map(Math.atan2.bind(Math, 90))
 .map(Math.pow.bind(Math, 17))
 .map(Math.ceil.bind(Math))
 .map(Array.prototype.reduce.bind([0], String.fromCharCode.bind(String)))
 .join(' ')
 ;