Create 593. Valid Square

Author: jyoung2419

leetcode3/정진영/593. Valid Square

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+/**
+ * @param {number[]} p1
+ * @param {number[]} p2
+ * @param {number[]} p3
+ * @param {number[]} p4
+ * @return {boolean}
+ */
+var validSquare = function(p1, p2, p3, p4) {
+    function distance(a,b){
+        let dx = a[0] - b[0];
+        let dy = a[1] - b[1];
+
+        return dx * dx + dy * dy;
+    }
+
+     let arr = [
+        distance(p1, p2),
+        distance(p1, p3),
+        distance(p1, p4),
+        distance(p2, p3),
+        distance(p2, p4),
+        distance(p3, p4)
+    ];
+
+    arr.sort((a, b) => a - b);
+
+    return (
+        arr[0] > 0 &&
+        arr[0] === arr[1] &&
+        arr[1] === arr[2] &&
+        arr[2] === arr[3] &&
+        arr[4] === arr[5]
+    );
+};