Implement simple map renderer

1 files changed, 33 insertions, 0 deletions

diff --git a/src/util.ts b/src/util.ts
new file mode 100644
index 0000000..337bf05
--- /dev/null
+++ b/src/util.ts
@@ -0,0 +1,33 @@
+import * as _ from 'lodash';
+
+
+export function mapFromObject<T>(obj: {[key: string]: T}): Map<string, T> {
+	return new Map(_.toPairs(obj));
+}
+
+export function mapValues<K, V1, V2>(f: (v: V1) => V2, map: Map<K, V1>): Map<K, V2> {
+	let ret: Map<K, V2> = new Map();
+
+	for (let [k, v] of map)
+		ret.set(k, f(v));
+
+	return ret;
+}
+
+export async function mapValuesAsync<K, V1, V2>(f: (v: V1) => Promise<V2>, map: Map<K, V1>): Promise<Map<K, V2>> {
+	let ret: Map<K, V2> = new Map();
+
+	for (let [k, v] of mapValues(f, map))
+		ret.set(k, await v);
+
+	return ret;
+}
+
+export function nextPowerOf2(n: number): number {
+	let i = 1;
+
+	while (i < n)
+		i *= 2;
+
+	return i;
+}