JSMS04- Multiple ways to swap two variables

1. Temporary variable method

	let a=5;
	let b=8;
	let tmp=a;
	a=b;
	b=tmp;
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2. Addition and subtraction

	a+=b;
	b=a-b;
	a=a-b;
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3. Deconstruction

	[a,b]=[b,a];
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4, array method, object method skip