added arithmetic shift operations

source/bits/arithmetic-shift-left.test.ts

@@ -0,0 +1,12 @@
+import { Bits } from '../types'
+import arithmeticShiftLeft from './arithmetic-shift-left'
+
+test('ASHIFTL', () => {
+    const bits1: Bits = [1, 0, 0, 0, 1, 1, 0, 1]
+    const expected1: Bits = [0, 0, 0, 1, 1, 0, 1, 0]
+    expect(arithmeticShiftLeft(bits1)).toEqual(expected1)
+
+    const bits2: Bits = [0, 0, 0, 0, 1, 1, 0, 1]
+    const expected2: Bits = [0, 0, 0, 1, 1, 0, 1, 0]
+    expect(arithmeticShiftLeft(bits2)).toEqual(expected2)
+})

source/bits/arithmetic-shift-left.ts

@@ -0,0 +1,19 @@
+import { Bits } from '../types'
+
+/**
+ * Arithmetic Shift Left
+ *
+ * @example
+ * arithmeticShiftLeft([1,0,1,1,0,1]) => [0,1,1,0,1,0]
+ *
+ * @param {Array} bits input data
+ * @return {Array} [ASHIFTL bits]
+ */
+export default (bits: Bits): Bits => {
+    const result: Bits = []
+
+    for (let i: number = 1; i < bits.length; i++) result[i - 1] = bits[i]
+    result[bits.length - 1] = (0 as Bit)
+
+    return result
+}

source/bits/arithmetic-shift-right.test.ts

@@ -0,0 +1,12 @@
+import { Bits } from '../types'
+import arithmeticShiftRight from './arithmetic-shift-right'
+
+test('ASHIFTR', () => {
+    const bits1: Bits = [1, 0, 0, 0, 1, 1, 0, 1]
+    const expected1: Bits = [1, 1, 0, 0, 0, 1, 1, 0]
+    expect(arithmeticShiftRight(bits1)).toEqual(expected1)
+
+    const bits2: Bits = [0, 0, 0, 0, 1, 1, 0, 1]
+    const expected2: Bits = [0, 0, 0, 0, 0, 1, 1, 0]
+    expect(arithmeticShiftRight(bits2)).toEqual(expected2)
+})

source/bits/arithmetic-shift-right.ts

@@ -0,0 +1,19 @@
+import { Bit, Bits } from '../types'
+
+/**
+ * Arithmetic Shift Right
+ *
+ * @example
+ * arithmeticShiftRight([1,0,1,1,0,1]) => [1,1,0,1,1,0]
+ *
+ * @param {Array} bits input data
+ * @return {Array} [ASHIFTR bits]
+ */
+export default (bits: Bits): Bits => {
+    const result: Bits = []
+
+    result[0] = bits[0]
+    for (let i: number = 0; i < bits.length - 1; i++) result[i + 1] = bits[i]
+
+    return result
+}

source/bits/index.ts

@@ -1,4 +1,6 @@
 import and from './and'
+import arithmeticShiftLeft from './arithmetic-shift-left'
+import arithmeticShiftRight from './arithmetic-shift-right'
 import nand from './nand'
 import nor from './nor'
 import not from './not'
@@ -16,6 +18,8 @@ import xor from './xor'
 
 export {
 	and,
+	arithmeticShiftLeft,
+	arithmeticShiftRight,
 	nand,
 	nor,
 	not,
@@ -34,6 +38,8 @@ export {
 
 export default {
 	and,
+	arithmeticShiftLeft,
+	arithmeticShiftRight,
 	nand,
 	nor,
 	not,