I am working with a specific data type
type Vehicle={
[key: string]: string;
};
let allCars:Vehicle = {Ford: "Ka", GM:"Sonic", Audi:"A4"};
Is there a way to determine the length of this object?
It seems like using allCars.length won't work in this case
If you want to find out the length of an array in JavaScript, you can simply use
arrayVariable.length
For example:
arrayVariable = [1, 2, 3, 4, 5]
console.log(arrayVariable.length);
--
In your code snippet, it appears that allCars is not actually an array but an object.
To get the number of properties in your custom object, you can utilize Object.keys():
var numberOfKeys = Object.keys(allCars).length;
If this is something you require, there might be some concerns regarding the data model being used.
--
An alternative approach would be to utilize a map data structure instead of an object and access the size property.
let allCars = new Map();
allCars.set('Ford', 'Ka');
allCars.set('GM', 'Sonic');
allCars.set('Audi', 'A4');
console.log(allCars.size);
However, this route may lead you in a different direction compared to the current code you are working with.
In order to determine the length of an array, you must create the array properly using square brackets. The code snippet provided actually only creates an object and not an array.
class Car { // represents a car
name: string;
model: string;
}
let allCars: Car[] = [{name: 'Ford', model: 'KA'}, {name: 'Audi', model: 'A4'}, ...and so on];
console.log(allCars.length); // this will display the total number of cars in the array
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