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@frivolta
Last active January 10, 2020 13:36
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// Define a book type
type Book = {
title: string;
genre: string;
publicationYear: number;
};
// Define a list of types
const listOfBooks: Book[] = [
{
title:
'Dragon Of The Titans',
genre:
'fantasy',
publicationYear: 1992,
},
{
title:
'Queen Of Spring',
genre:
'drama',
publicationYear: 2005,
},
{
title:
'Wolves Of The King',
genre:
'fantasy',
publicationYear: 1988,
},
];
// Use a common function to retrieve books
const filterArrayByValue = (
items: Book[],
propertyName: string,
valueToFilter: string
): Book[] => {
return items.filter(
item =>
item[
propertyName
] ===
valueToFilter
);
};
// Call the function
// The result is an array with two books: "Dragon Of The Titans" and "Wolves Of The King"
console.log(
filterArrayByValue(
listOfBooks,
'genre',
'fantasy'
)
);
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