ES6 -- conversion of arr (array) -map set

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List of articles

1. Array rotation map

 2.map Turn array

 3. Array to set

 4. Set array

 5. Multiple arrays to sets and map

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1. Array rotation map

         Must be a two-dimensional array

            var arr=[[1,"hello"],[2,"h5"],[3,{name:"karen"}]]
			var m1=new Map(arr)
			console.log(m1);

Running results ：

 2.map Turn array

        Array.from() Static methods

            var arr=[[1,"hello"],[2,"h5"],[3,{name:"karen"}]]
			var m1=new Map(arr)

			var arr2=Array.from(m1)
			console.log(arr,m1,arr2,arr==arr2,arr[2][1]==arr2[2][1])

Running results ：

 3. Array to set

            var arr=[100,200,100,{age:20},{age:20}]
			var s1=new Set(arr)
			console.log(s1,s1.size)

Running results ：

 

 4. Set array

            var arr=[100,200,100,{age:20},{age:20}]
			var s1=new Set(arr)

		    var arr2=Array.from(s1)
			console.log(arr2,arr[4]==arr2[3])

Running results ：

 5. Multiple arrays to sets and map

            var arr1=[10,20]
			var arr2=[100,20]
			var arr3=[200,{name:"karen"}]
			var s1=new Set([...arr1,...arr2,arr3])
			var m1=new Map([arr1,arr2,arr3])
			var m2=new Map(m1)
			console.log(m1,m2,m1==m2,m1.get(200)==m2.get(200))

            
            var mySet=new Set(" hel  lo  Huaqing vision \n")
			console.log(mySet);

Running results ：