Added more simple exercises.

jonasraoni · jonasraoni · commit 0bb48ad72612 · 2021-02-26T12:59:14.000+03:00
diff --git a/firstUniqChar.js b/firstUniqChar.js
@@ -0,0 +1,18 @@
+//+ Jonas Raoni Soares Silva
+//@ http://raoni.org
+
+var firstUniqChar = function(s) {
+	const unique = new Map();
+	const duplicated = new Set();
+	for(let i = -1; ++i < s.length; ) {
+		const c = s[i];
+		if (unique.has(c)) {
+			unique.delete(c);
+			duplicated.add(c);
+		} else if (!duplicated.has(c))
+			unique.set(c, i);
+	}
+	for (const index of unique.values())
+		return index;
+	return -1;
+};
diff --git a/reverse.js b/reverse.js
@@ -0,0 +1,11 @@
+//+ Jonas Raoni Soares Silva
+//@ http://raoni.org
+
+var reverse = function(x) {
+	const isNegative = x < 0;
+	let digits = [...(x + '')].reverse();
+	if (isNegative)
+		digits.unshift(digits.pop());
+	digits = +digits.join('');
+	return digits > 2 ** 31 - 1 || digits < (-2) ** 31 ? 0 : digits;
+};
diff --git a/reverseString.js b/reverseString.js
@@ -0,0 +1,6 @@
+//+ Jonas Raoni Soares Silva
+//@ http://raoni.org
+
+var reverseString = function(s) {
+	return s.reverse();
+};
