Description

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Beginner · 9 min

Find and test array items

Find one matching value or test whether some or all values meet a condition.

Find the first match

find() returns the first matching item, or undefined when no item matches. Use optional access when the result might be missing.

const products = [{ name: "Pen", price: 2 }, { name: "Book", price: 8 }];
const item = products.find(product => product.price > 5);
console.log(item?.name ?? "Not found");

Output

Book

Test a collection

some() checks whether at least one item passes a test. every() checks whether all items pass. For an empty array, some() is false and every() is true.

const scores = [6, 8, 4];
console.log(scores.some(score => score >= 8));
console.log(scores.every(score => score >= 5));

Output

true
false

Put it into practice

  1. Predict each result before running the example.
  2. Complete the coding task, then explain why your solution works.

Try it yourself

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Find an available product

Find the first product whose stock is greater than 0. Display its name.

Practice