solved: 8

Author: ryoppippi

code/8.string-to-integer-atoi.ts

@@ -0,0 +1,33 @@
+// @leet start
+function myAtoi(_s: string): number {
+  const s = _s.trim();
+
+  if (!s) {
+    return 0;
+  }
+
+  let i = 0;
+
+  while (i < s.length) {
+    const c = s[i];
+    if (!("0" <= c && c <= "9") && c !== "." && c !== "-" && c !== "+") {
+      break;
+    }
+    i++;
+  }
+
+  const num = parseInt(s.slice(0, i), 10);
+
+  switch (true) {
+    case isNaN(num):
+      return 0;
+    case num > Math.pow(2, 31) - 1:
+      return Math.pow(2, 31) - 1;
+    case num < -Math.pow(2, 31):
+      return -Math.pow(2, 31);
+    default:
+      return num;
+  }
+}
+// @leet end
+