Defining Interface

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You can think of Typescript interface as "data structure" that describes the properties of an object.

Suppose you want a Stock object that takes in name & quantity thereafter add to an array for some processing.

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Copy the code below to run on an online typescript compiler.

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interface Stock { name: string; qty: number; } let inventory: Stock[] = [ { name: 'apples', qty: 2 }, { name: 'bananas', qty: 0 }, { name: 'apples', qty: 5 } ]; inventory.push( { name: 'berries', qty: 3 }, { name: 'cherries', qty: 4 } ); console.log("All in Array :", inventory); console.log("Search Bananas :", inventory.find(e => e.name === 'bananas')); console.log("Search All Cherries :", inventory.filter(e => e.name === 'cherries'));

Explaination:

Here we created an Stock interface that holds the properties of name and qty. Loaded it with some default constant data thereafter added two new data to the array & added filtering functions.