the bracket takes time lol
methods were utiliezed:
forEach、typeof、includes、?:

Because that requires Node v20: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/toSpliced#browser_compatibility

I have tried to solve that issue by using 'toSpliced method' which allows to create an copy instead of only 'splice method' (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/toSpliced).
But the compiler keeps telling me it isn't a function(??).

"==" is interesting test
until now i recorgnize the benefit of arrow function's magic

kata hint != kata suggestion

map? creat a new array ,it sounds much more logical than slice method,and map method could smoothly do a loop

what a crazy code lol. Just utilize slice method to create a totally new array.🤔😴😴🤩