How JavaScript removes repetitive characters from numbers

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Deduplication methods: 1, use toString () and split () methods to convert numbers into character arrays; 2, use "[... new Set (arr)]" or "Array.from (new Set (arr))" statements to remove repeated characters; 3, convert the deduplicated array into numbers.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

JavaScript removes repetitive characters from numbers

In JavaScript, to remove repetitive characters from numbers, you can use the method of array de-duplication:

Convert numbers to character arrays first

In the use of Set to array de-weight.

Turns the array back to a number.

How to convert numbers to character arrays:

Var num=12345654123;var str = num.toString (); var arr=str.split ("")

Then use Set to remove the weight of the array, there are two ways:

Method 1:

Var newArr = [... new Set (arr)]

Method 2:

Var newArr = Array.from (new Set (arr))

The output results are consistent:

Finally, turn the array back to the number.

Var str=newArr.join (") var newNum=Number (str)

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