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const { Stack } = require('@hypercubed/f-flat@0.0.6');
const f = new Stack();
f.eval(`
core: rcl use
types: rcl use
math: rcl use
xxs: [ [ first ] [ rest ] bi ] ;;
// This is an alternative to pattern matching
// This, and pattern matching, will be coming soon
/**
* Calls the second quotation in the first pair whose first quotation yields a true value.
*/
cond: [
dup length 0 >
[
xxs
slip
slipd
[ cond ] >>
branch
] when
] ;
`).stack;
From Wikipedia:
A happy number is a number defined by the following process:
Starting with any positive integer, replace the number by the sum of the squares of its digits in base-ten, and repeat the process until the number either equals 1 (where it will stay), or it loops endlessly in a cycle that does not include 1. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are unhappy numbers (or sad numbers).
f.eval(`
πͺ: [
string // convert to a string
'' / // split into characters
[ number 2 ^ ] map // convert each to a number and square
sum // sum the values
] ;
π€: [
floor // ensure value is an integer
[
[[dup 1 =] [drop true]] // true if === 1
[[dup 4 =] [drop false]] // false if === 4
[[true] [πͺ π€]] // rinse and repeat otherwise
] cond
] ;
π: [
integers // create a list of n integers
[ π€ ] filter // filter for π integers
] ;
`).stack.toString();
f.eval(`
100 π
`).stack.toString();
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