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Update output.js

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Original file line number	Diff line number	Diff line change
`@@ -3,3 +3,20 @@`
`3`	`3`
`4`	`4`	`// 2) What is the output of "10"+20+30 in JavaScript?`
`5`	`5`	`// Ans: 102030 because after a string all the + will be treated as string concatenation operator (not binary +).`
	`6`	`+`
	`7`	`+// 3) Output?`
	`8`	`+// Syncronous`
	`9`	`+[1, 2, 3, 4].forEach((i) => {`
	`10`	`+ console.log(i)`
	`11`	`+})`
	`12`	`+`
	`13`	`+// Asynchronous`
	`14`	`+function asyncForEach(array, cb) {`
	`15`	`+ array.forEach(() => {`
	`16`	`+ setTimeout(cb, 0);`
	`17`	`+ })`
	`18`	`+}`
	`19`	`+`
	`20`	`+asyncForEach([1, 2, 3, 4], (i) => {`
	`21`	`+ console.log(i);`
	`22`	`+})`

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