* Create a cached version of a pure function.
(fn)
| 154 | * Create a cached version of a pure function. |
| 155 | */ |
| 156 | function cached(fn) { |
| 157 | var cache = Object.create(null); |
| 158 | return function cachedFn(str) { |
| 159 | var hit = cache[str]; |
| 160 | return hit || (cache[str] = fn(str)); |
| 161 | }; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Camelize a hyphen-delimited string. |