Remove the quotation marks that are numbers in the array

I thought of the problem when typing the code today ： When using split() When the function converts a string to an array , The number inside will also become string type .

let str = 'abc123abc123';
let str1= str1.split('');
console.log(str1); // prints  ['a', 'b', 'c', '1', '2', '3', 'a', 'b', 'c', '1', '2', '3']

You can call map Function to remove the quotation marks that are numbers in the array , Make it into a number type .

	let str = 'abc123abc123';
    let str2 = str.split('');

    let newStr = str2.map(item => {
    
    //  Judge   After converting this item into an array, it is not equal to NaN,  Just perform the conversion operation 
      if (!isNaN(item - 0)) {
      //  Use + -  And other mathematical symbols can be converted into Number data type 
        return item - 0;
      } else {
    
        return item;
      }
    });
    console.log(newStr);  //  Print (12) ['a', 'b', 'c', 1, 2, 3, 'a', 'b', 'c', 1, 2, 3]