# Salinger, Nabokov and Tupac do JavaScript

*(New Book “If Hemingway wrote JavaScript” Now Available)*

So anyway, I asked J.D. Salinger, Geoffrey Chaucer, Tupac Shakur, Virginia Woolf and Vladimir Nabokov to solve the happy numbers problem in JavaScript. Amazingly they all responded. Here’s how they did…

# The Problem #

A happy number is one which, when repeatedly replaced by the sum of the squares of its digits, will tend towards 1. By way of reference here’s a bog-standard solution:

```
function isHappy(n) {
// to avoid infinite looping, keep a history of numbers already visited
var history = {'1': true}, nextNum;
while( !history.hasOwnProperty(nextNum) ) {
nextNum = 0; // prepare to calculate the next number in the series
history[n] = true;
// split the number into digits and square each one
n.toString().split('').map(function(digit) {
return digit * digit;
}).forEach(function(squaredDigit) {
```

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