Convenient array signals for S.js.
SArray adds utility methods to S signals carrying arrays. These utility methods parallel the standard ES3/5/6 array methods.
// transformations without SArray var arr = S.data([1, 2, 3]), mapped = S(() => arr().map((x) => x * 2)), filtered = S(() => arr().filter((x) => x > 2)); // transformations with SArray var arr = SArray([1, 2, 3]), mapped = arr.map((x) => x * 2), // arr() now has array methods filtered = arr.filter((x) => x > 2); // mutations without SArray var tmp = S.sample(arr).slice(0); tmp.push(4); arr(tmp); // mutations with SArray arr.push(4); // SArray methods also return SArrays var mappedAndFiltered = arr.map((x) => x * 2).filter((x) => x > 2); // Any array-carrying signal can be 'lifted' to create an SArray var plain = S.data([1, 2, 3]), arr = SArray.lift(plain), mapped = arr.map((x) => x * 2); // etc // When an array signal changes, map() will re-use prior computations // for new items that === the old. var rands = arr.map(() => Math.random().toFixed(2)); rands(); // ["0.83", "0.75", "0.77"] arr.push(4); rands(); // ["0.83", "0.75", "0.77", "0.25"] unchanged values reused
For a full list of methods and their signatures, consult index.ts.