feat: create twitter.js

Author: As'ad Saleh Umar

package-lock.json

@@ -0,0 +1,49 @@
+const args = process.argv.slice(2);
+
+const test1 = "Codility we test coders";
+
+if (args.length > 1) {
+  args.forEach((arg) => solution(test1, arg));
+} else {
+  solution(test1, Number(args[0]));
+}
+
+function solution(message, K) {
+  const curIdx = K - 1;
+  if (K >= message.length) {
+    result = message;
+  } else if (message[curIdx] === " ") {
+    result = message.substring(0, curIdx);
+  } else if (message[curIdx + 1] === " ") {
+    result = message.substring(0, curIdx + 1);
+  } else if (message[curIdx - 1] === " ") {
+    result = message.substring(0, curIdx - 1);
+  } else {
+    // berarti ditengah. cari apakah dia punya space awal:
+    const prevSpaceIdx = getPrevSpace(message, K - 1);
+    if (prevSpaceIdx != -1) {
+      console.log("dari sini?");
+      result = message.substring(0, prevSpaceIdx);
+    } else {
+      result = "";
+    }
+  }
+
+  console.log("=============== input : ", message, ". limit: ", K);
+  console.log("=============== result: ", `"${result}"`);
+
+  return result;
+}
+
+function getPrevSpace(message, startIndex) {
+  let count = 0;
+  for (let i = startIndex; i >= 0; i--) {
+    if (i === 0) {
+      return -1;
+    }
+    if (message[i] === " ") {
+      return startIndex - count;
+    }
+    count++;
+  }
+}