js array removes invalid values (null, undefined)

1. Do not filter Boolean values ​​and empty strings

var arr=[1,2,null,undefined,9,0,NaN,,'',true];

arr=arr.filter(x=>!!x==true||x==0);   //[1, 2, 9, 0,'',true]

2. Boolean can be filtered, custom filter rules

let arr = ["",false,NaN,null,undefined,"123", ,"test",123,true];
let newarr = arr.filter(item=>!["",null,undefined,NaN,false,true].includes(item));
console.log(arr,newarr)
//  ['', false, NaN, null, undefined, '123', empty, 'test', 123, true] 
//  ['123', 'test', 123]

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