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every()

every<T>(collection, predicate): boolean

every<T>(collection, predicate): boolean

Checks if predicate returns truthy for all elements of collection.

DEPRECATED

Use array.every() or Object.values().every() directly instead.

Type Parameters​

T: T​

The type of elements in the array, or the object type.

Parameters​

Overload 1:

collection: T[]​

The collection to iterate over.

predicate: (value, index, array) => boolean​

The function invoked per iteration.

Overload 2:

collection: T​

The collection to iterate over.

predicate: (value, key, object) => boolean​

The function invoked per iteration.

Returns: boolean​

true if all elements pass the predicate check, else false.

See Also​

Since​

2.0.0

Also known as​

all (Ramda) · every (Lodash, es-toolkit, Effect) · ❌ (Remeda, Radashi, Modern Dash, Antfu)

Example​

const numbers = [1, 2, 3, 4, 5];

// ❌ Deprecated approach
const allPositive = every(numbers, n => n > 0);
console.log(allPositive); // true

// ✅ Recommended approach (for arrays)
const allPositiveNative = numbers.every(n => n > 0);
console.log(allPositiveNative); // true

// ✅ Recommended approach (for objects)
const obj = { a: 1, b: 2, c: 3 };
const allPositiveObj = Object.values(obj).every(n => n > 0);
console.log(allPositiveObj); // true

How it works?​

Checks if all elements pass the predicate. Deprecated: Use array.every() directly.

Native Equivalent​

// ❌ every(arr, fn)
// ✅ arr.every(fn)

Use Cases​

Validate all items match criteria 📌​

Check if all elements satisfy a condition.

const ages = [18, 25, 30, 22];
ages.every(age => age >= 18);
// => true

Check form validity​

Verify all form fields are valid.

const fields = [{ value: "a" }, { value: "b" }, { value: "" }];
fields.every(f => f.value.length > 0);
// => false

Ensure permissions granted​

Check if all required permissions are granted.

const permissions = ["read", "write", "execute"];
const granted = ["read", "write", "execute"];
permissions.every(p => granted.includes(p));
// => true

Validate uploaded files meet constraints​

Check that all files in an upload batch respect size and type limits. Essential for file upload forms, document management, and media libraries.

const maxSize = 5 * 1024 * 1024; // 5MB
const allowedTypes = ["image/png", "image/jpeg", "application/pdf"];

const files = [
  { name: "photo.jpg", size: 2_000_000, type: "image/jpeg" },
  { name: "doc.pdf", size: 1_500_000, type: "application/pdf" },
  { name: "huge.png", size: 8_000_000, type: "image/png" },
];

const allValid = every(files, (f) => f.size <= maxSize && allowedTypes.includes(f.type));
// => false (huge.png exceeds 5MB)