How to filter out a value from an array of objects?

Question

How to remove the value "nissan", from an array of objects?

const cars = [
   {type: "audi", amount: 2},
   {type: "nissan", amount: 12},
   {type: "mazda", amount: 5},
   {type: "volvo", amount: 5}
]

This is how I display all the types and amounts:

cars.map(car => {
   return (
     <div>{car.type}: {car.amount}</div>
   );
});

But I would like to remove the value "nissan", before mapping over the cars, how could I do that with .filter?

removeNissan() {
   // cars.type !== "nissan"
}

cars.filter(removeNissan).map(car => {
   return (
     <div>{car.type}: {car.amount}</div>
   );
});

Answer 1

Use Array#filter function before map function

const cars = [
   {type: "audi", amount: 2},
   {type: "nissan", amount: 12},
   {type: "mazda", amount: 5},
   {type: "volvo", amount: 5}
]


cars.filter(item => item.type !== 'nissan').map(car => {
   return (
     <div>{car.type}: {car.amount}</div>
   );
});

Or if you want to use a named function, declare your function

removeNissan(car) {
   return car.type !== "nissan";
}

filter will pass the each item as argument to the function.