added arithmetic shift operations

source/bits/ashiftl.test.ts

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+import { Bits } from '../types'
+import ashiftl from './ashiftl'
+
+test('ASHIFTL', () => {
+    const bits1: Bits = [1, 0, 0, 0, 1, 1, 0, 1]
+    const expected1: Bits = [1, 1, 0, 0, 0, 1, 1, 0]
+    expect(ashiftl(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(ashiftl(bits2)).toEqual(expected2)
+})

source/bits/ashiftl.ts

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

source/bits/ashiftr.test.ts

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+import { Bits } from '../types'
+import ashiftr from './ashiftr'
+
+test('ASHIFTR', () => {
+    const bits1: Bits = [1, 0, 0, 0, 1, 1, 0, 1]
+    const expected1: Bits = [0, 0, 0, 1, 1, 0, 1, 0]
+    expect(ashiftr(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(ashiftr(bits2)).toEqual(expected2)
+})

source/bits/ashiftr.ts

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