My array is

arrays=[1, 2, 3]

index for array is
arrays=[ 0:1 , 1:2, 2:3  ]

my variable is

id=3

I have to check if 3 is in array and 3 is in the index value of 2.

I am using for loop

for (let z in this.arrays){
    if(id in this.arrays[z]){
       console.log("duplicate")
    }
}

but I got an error

ERROR TypeError: Cannot use ‘in’ operator to search for ‘2’ in 1

How to do that using javascript

Source: Ask Javascript Questions