README
OrdMap
Map data structure that remembers the order keys/values are set. Allows for easy access of first and last keys/values and iteration in order of insertion. Comes with type declarations for TypeScript and extends native Map class.
npm
npm i --save ord-map
yarn
yarn add ord-map
Usage
import {OrdMap} from "ord-map";
const map = new OrdMap();
// The order of keys set are remembered
map.set("b", 3);
map.set("_", 0.1);
map.set("a", 1);
console.assert(map.firstKey === "b");
console.assert(map.firstValue === 3);
console.assert(map.lastKey === "a");
console.assert(map.lastValue === 1);
// Supports any key and value that built-in map supports
map.set(true, Number);
// Setting existing keys will not change their position
map.set("b", 4);
console.assert(map.firstKey === "b");
// Iterating will iterate values in the order they were set
for (const [key, value] of map.entries()) {
console.log(key, value);
}
For full API reference, see OrdMap.ts.
Testing
Run npm run test
.
Building
Run npm run build
. The built files will be in dist
.