Commit 2919098

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Create Allow One Function Call

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	`1`	`+/*`
	`2`	`+Example 1:`
	`3`	`+`
	`4`	`+Input: fn = (a,b,c) => (a + b + c), calls = [[1,2,3],[2,3,6]]`
	`5`	`+Output: [{"calls":1,"value":6}]`
	`6`	`+Explanation:`
	`7`	`+const onceFn = once(fn);`
	`8`	`+onceFn(1, 2, 3); // 6`
	`9`	`+onceFn(2, 3, 6); // undefined, fn was not called`
	`10`	`+*/`
	`11`	`+`
	`12`	`+type Fn = (...args: any[]) => any`
	`13`	`+`
	`14`	`+function once(fn: Fn): Fn {`
	`15`	`+ let hasBeenCalled: any = false;`
	`16`	`+ let result: number[];`
	`17`	`+ return function (...args): any \| undefined {`
	`18`	`+ if(!hasBeenCalled){`
	`19`	`+ result = fn(...args);`
	`20`	`+ hasBeenCalled = true;`
	`21`	`+ return result;`
	`22`	`+ }else{`
	`23`	`+ return undefined;`
	`24`	`+ }`
	`25`	`+ };`
	`26`	`+}`
	`27`	`+`
	`28`	`+/**`
	`29`	`+ * let fn = (a,b,c) => (a + b + c)`
	`30`	`+ * let onceFn = once(fn)`
	`31`	`+ *`
	`32`	`+ * onceFn(1,2,3); // 6`
	`33`	`+ * onceFn(2,3,6); // returns undefined without calling fn`
	`34`	`+ */`

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