Fixes

Author: Alexander Belov

src/lib/math/index.ts

@@ -1 +1,2 @@
 export * from './is-power-of-two/is-power-of-two';
+export * from './nearest-highest-power-of-two/nearest-highest-power-of-two';

src/lib/math/nearest-highest-power-of-two/nearest-highest-power-of-two.spec.ts

@@ -0,0 +1,25 @@
+// tslint:disable:no-expression-statement
+import test from 'ava';
+import { nearestHighestPowerOfTwo } from './nearest-highest-power-of-two';
+
+test('nearest highest power of two', t => {
+  const tests = [
+    [ 1, 0 ],
+    [ 2, 1 ],
+    [ 3, 2 ],
+    [ 5, 3 ],
+    [ 11, 4 ],
+    [ 1023, 10 ],
+    [ 1024, 10 ],
+    [ 1025, 11 ],
+    [ 2 ** 31 - 1, 31 ],
+    [ 2 ** 78 - 1, 78 ],
+    [ 2 ** 78 + 1, 79 ],
+  ];
+
+  for (const v of tests) {
+    const [ value, power ] = v;
+
+    t.is(nearestHighestPowerOfTwo(value), power);
+  }
+});

src/lib/math/nearest-highest-power-of-two/nearest-highest-power-of-two.ts

@@ -0,0 +1,9 @@
+/**
+ * Returns nearest highest power of two from specific number
+ *
+ * @param {number} value
+ * @returns {number}
+ */
+export function nearestHighestPowerOfTwo(value: number): number {
+  return Math.ceil(Math.log2(value));
+}