Create 238.除自身以外数组的乘积.js

Author: yinxin630

238.除自身以外数组的乘积.js

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+/**
+ * @param {number[]} nums
+ * @return {number[]}
+ */
+var productExceptSelf = function(nums) {
+    const a = [nums[0]];
+    const b = [nums[nums.length - 1]];
+    for (let i = 1; i < nums.length; i++) {
+        a.push(a[i - 1] * nums[i]);
+        b.push(b[i - 1] * nums[nums.length -1 - i]);
+    }
+    return nums.map((n, i) => {
+        return (a[i - 1] === undefined ? 1 : a[i - 1]) * (b[b.length - 2 - i] === undefined ? 1 : b[b.length - 2 - i]);
+    })
+};