add compact.md & ran npm run build-list

snippets/compact.md

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+### Compact
+
+Use `.filter()` to filter falsey values. For example false, null, 0, "", undefined, and NaN are falsey.
+
+```js
+const compact = (arr) => arr.filter( v => [0, null, false, '', undefined].indexOf(v) === -1 && v);
+// compact([0, 1, false, 2, '', 3, 'a', 'e'*23, NaN, 's', 34]) -> [ 1, 2, 3, 'a', 's', 34 ]
+```