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896. Monotonic Array

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	`1`	`+/**`
	`2`	`+ * https://leetcode.com/problems/monotonic-array/`
	`3`	`+ * 896. Monotonic Array`
	`4`	`+ * @param {number[]} A`
	`5`	`+ * @return {boolean}`
	`6`	`+ */`
	`7`	`+var isMonotonic = function (A) {`
	`8`	`+ if (A.length < 3) {`
	`9`	`+ return true;`
	`10`	`+ }`
	`11`	`+ let delta = 0;`
	`12`	`+ let type = 0;`
	`13`	`+ for (let i = 1; i < A.length; i++) {`
	`14`	`+ delta = A[i] - A[i - 1];`
	`15`	`+ if (delta === 0) {`
	`16`	`+ continue;`
	`17`	`+ }`
	`18`	`+ if (type === 0) {`
	`19`	`+ type = delta;`
	`20`	`+ }`
	`21`	`+ if (delta > 0 && type >= 0) {`
	`22`	`+ continue;`
	`23`	`+ }`
	`24`	`+ if (delta < 0 && type <= 0) {`
	`25`	`+ continue;`
	`26`	`+ }`
	`27`	`+ return false;`
	`28`	`+ }`
	`29`	`+ return true;`
	`30`	`+};`

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