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effect

Number overview

This module provides utility functions and type class instances for working with the number type in TypeScript. It includes functions for basic arithmetic operations, as well as type class instances for Equivalence and Order.

Added in v2.0.0

Table of contents

constructors

parse

Tries to parse a number from a string using the Number() function. The following special string values are supported: “NaN”, “Infinity”, “-Infinity”.

Signature

export declare const parse: (s: string) => Option<number>

Added in v2.0.0

guards

isNumber

Tests if a value is a number.

Signature

export declare const isNumber: (input: unknown) => input is number

Example

import { isNumber } from "effect/Number"

assert.deepStrictEqual(isNumber(2), true)
assert.deepStrictEqual(isNumber("2"), false)

Added in v2.0.0

instances

Equivalence

Signature

export declare const Equivalence: equivalence.Equivalence<number>

Added in v2.0.0

Order

Signature

export declare const Order: order.Order<number>

Added in v2.0.0

math

decrement

Decrements a number by 1.

Signature

export declare const decrement: (n: number) => number

Example

import { decrement } from "effect/Number"

assert.deepStrictEqual(decrement(3), 2)

Added in v2.0.0

divide

Provides a division operation on numbers.

Signature

export declare const divide: {
  (that: number): (self: number) => Option<number>
  (self: number, that: number): Option<number>
}

Example

import { Number, Option } from "effect"

assert.deepStrictEqual(Number.divide(6, 3), Option.some(2))
assert.deepStrictEqual(Number.divide(6, 0), Option.none())

Added in v2.0.0

increment

Returns the result of adding 1 to a given number.

Signature

export declare const increment: (n: number) => number

Example

import { increment } from "effect/Number"

assert.deepStrictEqual(increment(2), 3)

Added in v2.0.0

multiply

Provides a multiplication operation on numbers.

Signature

export declare const multiply: { (that: number): (self: number) => number; (self: number, that: number): number }

Example

import { multiply } from "effect/Number"

assert.deepStrictEqual(multiply(2, 3), 6)

Added in v2.0.0

multiplyAll

Takes an Iterable of numbers and returns their multiplication as a single number.

Signature

export declare const multiplyAll: (collection: Iterable<number>) => number

Example

import { multiplyAll } from "effect/Number"

assert.deepStrictEqual(multiplyAll([2, 3, 4]), 24)

Added in v2.0.0

nextPow2

Returns the next power of 2 from the given number.

Signature

export declare const nextPow2: (n: number) => number

Example

import { nextPow2 } from "effect/Number"

assert.deepStrictEqual(nextPow2(5), 8)
assert.deepStrictEqual(nextPow2(17), 32)

Added in v2.0.0

remainder

Returns the remainder left over when one operand is divided by a second operand.

It always takes the sign of the dividend.

Signature

export declare const remainder: { (divisor: number): (self: number) => number; (self: number, divisor: number): number }

Example

import { remainder } from "effect/Number"

assert.deepStrictEqual(remainder(2, 2), 0)
assert.deepStrictEqual(remainder(3, 2), 1)
assert.deepStrictEqual(remainder(-4, 2), -0)

Added in v2.0.0

round

Returns the number rounded with the given precision.

Signature

export declare const round: { (precision: number): (self: number) => number; (self: number, precision: number): number }

Example

import { round } from "effect/Number"

assert.deepStrictEqual(round(1.1234, 2), 1.12)
assert.deepStrictEqual(round(1.567, 2), 1.57)

Added in v3.8.0

sign

Determines the sign of a given number.

Signature

export declare const sign: (n: number) => Ordering

Example

import { sign } from "effect/Number"

assert.deepStrictEqual(sign(-5), -1)
assert.deepStrictEqual(sign(0), 0)
assert.deepStrictEqual(sign(5), 1)

Added in v2.0.0

subtract

Provides a subtraction operation on numbers.

Signature

export declare const subtract: { (that: number): (self: number) => number; (self: number, that: number): number }

Example

import { subtract } from "effect/Number"

assert.deepStrictEqual(subtract(2, 3), -1)

Added in v2.0.0

sum

Provides an addition operation on numbers.

Signature

export declare const sum: { (that: number): (self: number) => number; (self: number, that: number): number }

Example

import { sum } from "effect/Number"

assert.deepStrictEqual(sum(2, 3), 5)

Added in v2.0.0

sumAll

Takes an Iterable of numbers and returns their sum as a single number.

Signature

export declare const sumAll: (collection: Iterable<number>) => number

Example

import { sumAll } from "effect/Number"

assert.deepStrictEqual(sumAll([2, 3, 4]), 9)

Added in v2.0.0

unsafeDivide

Provides a division operation on numbers.

Throws a RangeError if the divisor is 0.

Signature

export declare const unsafeDivide: { (that: number): (self: number) => number; (self: number, that: number): number }

Example

import { unsafeDivide } from "effect/Number"

assert.deepStrictEqual(unsafeDivide(6, 3), 2)

Added in v2.0.0

predicates

between

Checks if a number is between a minimum and maximum value (inclusive).

Signature

export declare const between: {
  (options: { minimum: number; maximum: number }): (self: number) => boolean
  (self: number, options: { minimum: number; maximum: number }): boolean
}

Example

import { Number } from "effect"

const between = Number.between({ minimum: 0, maximum: 5 })

assert.deepStrictEqual(between(3), true)
assert.deepStrictEqual(between(-1), false)
assert.deepStrictEqual(between(6), false)

Added in v2.0.0

greaterThan

Returns true if the first argument is greater than the second, otherwise false.

Signature

export declare const greaterThan: { (that: number): (self: number) => boolean; (self: number, that: number): boolean }

Example

import { greaterThan } from "effect/Number"

assert.deepStrictEqual(greaterThan(2, 3), false)
assert.deepStrictEqual(greaterThan(3, 3), false)
assert.deepStrictEqual(greaterThan(4, 3), true)

Added in v2.0.0

greaterThanOrEqualTo

Returns a function that checks if a given number is greater than or equal to the provided one.

Signature

export declare const greaterThanOrEqualTo: {
  (that: number): (self: number) => boolean
  (self: number, that: number): boolean
}

Example

import { greaterThanOrEqualTo } from "effect/Number"

assert.deepStrictEqual(greaterThanOrEqualTo(2, 3), false)
assert.deepStrictEqual(greaterThanOrEqualTo(3, 3), true)
assert.deepStrictEqual(greaterThanOrEqualTo(4, 3), true)

Added in v2.0.0

lessThan

Returns true if the first argument is less than the second, otherwise false.

Signature

export declare const lessThan: { (that: number): (self: number) => boolean; (self: number, that: number): boolean }

Example

import { lessThan } from "effect/Number"

assert.deepStrictEqual(lessThan(2, 3), true)
assert.deepStrictEqual(lessThan(3, 3), false)
assert.deepStrictEqual(lessThan(4, 3), false)

Added in v2.0.0

lessThanOrEqualTo

Returns a function that checks if a given number is less than or equal to the provided one.

Signature

export declare const lessThanOrEqualTo: {
  (that: number): (self: number) => boolean
  (self: number, that: number): boolean
}

Example

import { lessThanOrEqualTo } from "effect/Number"

assert.deepStrictEqual(lessThanOrEqualTo(2, 3), true)
assert.deepStrictEqual(lessThanOrEqualTo(3, 3), true)
assert.deepStrictEqual(lessThanOrEqualTo(4, 3), false)

Added in v2.0.0

utils

clamp

Restricts the given number to be within the range specified by the minimum and maximum values.

  • If the number is less than the minimum value, the function returns the minimum value.
  • If the number is greater than the maximum value, the function returns the maximum value.
  • Otherwise, it returns the original number.

Signature

export declare const clamp: {
  (options: { minimum: number; maximum: number }): (self: number) => number
  (self: number, options: { minimum: number; maximum: number }): number
}

Example

import { Number } from "effect"

const clamp = Number.clamp({ minimum: 1, maximum: 5 })

assert.equal(clamp(3), 3)
assert.equal(clamp(0), 1)
assert.equal(clamp(6), 5)

Added in v2.0.0

max

Returns the maximum between two numbers.

Signature

export declare const max: { (that: number): (self: number) => number; (self: number, that: number): number }

Example

import { max } from "effect/Number"

assert.deepStrictEqual(max(2, 3), 3)

Added in v2.0.0

min

Returns the minimum between two numbers.

Signature

export declare const min: { (that: number): (self: number) => number; (self: number, that: number): number }

Example

import { min } from "effect/Number"

assert.deepStrictEqual(min(2, 3), 2)

Added in v2.0.0