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add swap problem solving

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Original file line number	Diff line number	Diff line change
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	`1`	`+//before swap`
	`2`	`+var a = 5;`
	`3`	`+var b = 6;`
	`4`	`+`
	`5`	`+//After swap`
	`6`	`+var temp = a;`
	`7`	`+var a = b;`
	`8`	`+var b = temp;`
	`9`	`+console.log("after swap ", "a = ", a, "b = ", b);`
	`10`	`+//expected output: after swap x = 20 y = 10`
	`11`	`+`
	`12`	`+//Another way of doing the same thing`
	`13`	`+//before swap`
	`14`	`+var x = 10;`
	`15`	`+var y = 20;`
	`16`	`+`
	`17`	`+//after swap`
	`18`	`+var x = x + y;`
	`19`	`+var y = x - y;`
	`20`	`+var x = x - y;`
	`21`	`+console.log("after swap ", "x = ", x, "y = ", y);`
	`22`	`+//expected output: after swap x = 20 y = 10`
	`23`	`+`
	`24`	`+// The above tasks can be done very easily in JavaScript.`
	`25`	`+var p = 7;`
	`26`	`+var q = 8;`
	`27`	`+[p,q] = [q,p] //Set p & q with an array then invert its value`
	`28`	`+console.log("after swap ", "p = ", p, "q = ", q);`
	`29`	`+//expected output: after swap p = 8 q = 7`

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