1 files changed, 76 insertions, 0 deletions
diff --git a/src/utils.mjs b/src/utils.mjs
new file mode 100644
index 0000000..e0e20a7
--- /dev/null
+++ b/src/utils.mjs
@@ -0,0 +1,76 @@
+export const eq = (a, b) => {
+	if (a === b) {
+		return true;
+	}
+
+	if (a === null || b === null) {
+		return false;
+	}
+
+	if (typeof a != "object" || typeof b != "object") {
+		return false;
+	}
+
+	if (Array.isArray(a) !== Array.isArray(b)) {
+		return false;
+	}
+
+	if (Object.keys(a).length !== Object.keys(b).length) {
+		return false;
+	}
+
+	for (const k in a) {
+		if (!b.hasOwnProperty(k)) {
+			return false;
+		}
+		if (!eq(a[k], b[k])) {
+			return false;
+		}
+	}
+
+	return true;
+};
+
+export const keys = (ks, obj) =>
+	ks.reduce(
+		(ret, k) =>
+			obj.hasOwnProperty(k) ?  {...ret, [k]: obj[k]} : ret,
+		{},
+	);
+
+export const difference = (a, b) => {
+	const diff = new Set(a);
+	for (const el of b) {
+		diff.delete(el);
+	}
+	return diff;
+};
+
+export const assocIn = (obj, path, value) =>
+	path.length === 0 ?  obj :
+		path.length === 1 ? { ...obj, [path[0]]: value } :
+			{
+				...obj,
+				[path[0]]: assocIn(
+					(obj[path[0]] || {}),
+					path.slice(1),
+					value
+				)
+			};
+
+export const getIn = (obj, path) =>
+	path.length === 0 ? obj :
+		getIn(obj?.[path[0]], path.slice(1));
+
+export const first = (arr, fn) => {
+	for (const x of arr) {
+		const ret = fn(x);
+		if (ret) {
+			return ret;
+		}
+	}
+
+	return null;
+};
+
+export const log = o => console.error(JSON.stringify(o));