JSON Array element comparion with Java Script Array in Angular 2

I am working on Angular 2 with type script and came up with a very peculiar problem. I have a number array named empIds = {1,5,6,9,2} I have (a JSON Array) named empDetails = [{"employeeId":1,"employeeName":"Jhon"}, {"employeeId":2,"employeeName":"Ron"},{"employeeId":3,"employeeName":"Van"}]

Now i have to find out the only JSON objects who's id match in number array. Here is what i wrote

for(let i=0;i<empDetails.length;i++){
if(empIds.indexOf(empDetails[i].employeeId)==0 ){
//Employee ID is present save that JSON object to some other JSON Array
i should get details for matched id (1 and 2)
}else{
//Did not match
do nothing
}
}

i did put console.log for both if and else. My loop never matches it always goes to else condition? Is there any possible solution?