adds bubble sort

ts/binary_search.test.ts

@@ -0,0 +1,28 @@
+function binary_search(haystack: number[], needle: number): boolean {
+	let lo = 0;
+	let hi = haystack.length;
+
+	while (lo < hi) {
+		const m = Math.floor(lo + (hi - lo) / 2);
+		const v = haystack[m];
+
+		if (v === needle) {
+			return true;
+		} else if (v > needle) {
+		 	hi = m;
+		} else {
+			lo = m + 1;
+		}
+	}
+	return false;
+}
+
+test("test binary search", () => {
+	expect(binary_search([1, 2, 3, 4, 5, 6], 5)).toBe(true);
+
+})
+
+test("test binary search can return false", () => {
+	expect(binary_search([1, 2, 3, 4, 5, 6], 50)).toBe(false);
+
+})