add hw2

node_modules/b4a/lib/ascii.js

@@ -0,0 +1,31 @@
+function byteLength(string) {
+  return string.length
+}
+
+function toString(buffer) {
+  const len = buffer.byteLength
+
+  let result = ''
+
+  for (let i = 0; i < len; i++) {
+    result += String.fromCharCode(buffer[i])
+  }
+
+  return result
+}
+
+function write(buffer, string) {
+  const len = buffer.byteLength
+
+  for (let i = 0; i < len; i++) {
+    buffer[i] = string.charCodeAt(i)
+  }
+
+  return len
+}
+
+module.exports = {
+  byteLength,
+  toString,
+  write
+}