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404. Sum of Left Leaves

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	`1`	`+/**`
	`2`	`+ * 404. Sum of Left Leaves`
	`3`	`+ * https://leetcode.com/problems/sum-of-left-leaves/`
	`4`	`+ * Definition for a binary tree node.`
	`5`	`+ * function TreeNode(val) {`
	`6`	`+ * this.val = val;`
	`7`	`+ * this.left = this.right = null;`
	`8`	`+ * }`
	`9`	`+ */`
	`10`	`+/**`
	`11`	`+ * @param {TreeNode} root`
	`12`	`+ * @return {number}`
	`13`	`+ */`
	`14`	`+var sumOfLeftLeaves = function (root) {`
	`15`	`+ if (root === null) {`
	`16`	`+ return 0;`
	`17`	`+ }`
	`18`	`+ if (root.left !== null && root.left.left === null && root.left.right === null) {`
	`19`	`+ return root.left.val + sumOfLeftLeaves(root.right)`
	`20`	`+ }`
	`21`	`+ return sumOfLeftLeaves(root.left) + sumOfLeftLeaves(root.right);`
	`22`	`+};`

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