Added SetBit.js, SetBit.test.js in Bit-Manipulation directory

Bit-Manipulation/SetBit.js

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+/*
+ * Setting Bit: https://www.geeksforgeeks.org/set-k-th-bit-given-number/
+ *
+ * To set any bit we use bitwise OR (|) operator.
+ *
+ * Bitwise OR (|) compares the bits of the 32
+ * bit binary representations of the number and
+ * returns a number after comparing each bit.
+ *
+ * 0 | 0 -> 0
+ * 0 | 1 -> 1
+ * 1 | 0 -> 1
+ * 1 | 1 -> 1
+ *
+ * In-order to set kth bit of a number (where k is the position where bit is to be changed)
+ * we need to shift 1 k times to its left and then perform bitwise OR operation with the
+ * number and result of left shift performed just before.
+ *
+ * References:
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_OR
+ */
+
+/**
+ * @param {number} number
+ * @param {number} bitPosition - zero based.
+ * @return {number}
+ */
+
+export const setBit = (number, bitPosition) => {
+  return number | (1 << bitPosition)
+}

Bit-Manipulation/test/SetBit.test.js

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+import { setBit } from '../SetBit'
+
+test('Set bit number 0 in 1:', () => {
+  const setBitPos = setBit(1, 0)
+  expect(setBitPos).toBe(1)
+})
+
+test('Set bit number 0 in 2:', () => {
+  const setBitPos = setBit(2, 0)
+  expect(setBitPos).toBe(3)
+})
+
+test('Set bit number 1 in 10:', () => {
+  const setBitPos = setBit(10, 1)
+  expect(setBitPos).toBe(10)
+})
+
+test('Set bit number 2 in 10:', () => {
+  const setBitPos = setBit(10, 2)
+  expect(setBitPos).toBe(14)
+})