Add solution for the-vampiire#68 in javascript. (the-vampiire#128)

javascript/intermediate/multiple-cash-registers_sylvain1811.js

@@ -0,0 +1,35 @@
+/**
+ * Hacktoberithms - Multiple Cash Registers
+ * https://github.com/the-vampiire/hacktoberithms/issues/68
+ * By sylvain1811, 7 oct 2019
+ * node version v12.9.1
+ */
+
+function checkout_time(customers, n_cashier) {
+    let cashiers = Array(n_cashier).fill(0)
+    customers.forEach(customer => {
+        minIndex = cashiers.reduce((accIdx, current, index) => {
+            return current < cashiers[accIdx] ? index : accIdx
+        }, 0)
+        cashiers[minIndex] = cashiers[minIndex] + parseInt(customer)
+    });
+    return Math.max(...cashiers)
+}
+
+function test() {
+    cases = [
+        [[[5, 1, 3], 1], 9],
+        [[[10, 3, 4, 2], 2], 10]
+    ]
+    result = cases.reduce((acc, current, idx) => {
+        res = checkout_time(...current[0])
+        console.log("[Test case", idx, "] Inputs are ", current[0],
+            ", expected result is ", current[1],
+            ", result is ", res,
+            " : ", res == current[1] ? "PASS" : "FAILED");
+        return acc && res == current[1]
+    }, true)
+    result ? console.log("All tests passed") : console.log("Some tests failed")
+}
+
+test()