isx

Collection of validation functions for JavaScript data.

This is a very small collection of validate functions. It provides a custom type guard whenever it can.

Module structure and capability

Module can be divided into two categories.

Top-type module
Sub-type module

Top-type module

Top-type module can accept any JavaScript data. In other words, it accepts the unknown type, which is top-type.

Most of them can be used to identify the type by a type guard.

The module directly under namespace is it.

Sub-type module

Sub-type modules are modules that perform type-dependent operations. It can use type-specific methods and compare values.

For example, the module under number is a sub-type module that takes a number type as an argument.

isString

Whether the input is string or not.

import { isString } from "https://deno.land/x/isx@$VERSION/is_string.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isString("hello world"), true);
assertEquals(isString(1000), false);

isNumber

Whether the input is number or not.

import { isNumber } from "https://deno.land/x/isx@$VERSION/is_number.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isNumber(1000), true);
assertEquals(isNumber("hello world"), false);

isBigint

Whether the input is bigint or not.

import { isBigint } from "https://deno.land/x/isx@$VERSION/is_bigint.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isBigint(1000n), true);
assertEquals(isBigint(undefined), false);

isNull

Whether the input is null or not.

import { isNull } from "https://deno.land/x/isx@$VERSION/is_null.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isNull(null), true);
assertEquals(isNull(undefined), false);

isUndefined

Whether the input is undefined or not.

import { isUndefined } from "https://deno.land/x/isx@$VERSION/is_undefined.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isUndefined(undefined), true);
assertEquals(isUndefined(null), false);

isBoolean

Whether the input is boolean or not.

import { isBoolean } from "https://deno.land/x/isx@$VERSION/is_boolean.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isBoolean(true), true);
assertEquals(isBoolean(null), false);

isFunction

Whether the input is Function or not.

import { isFunction } from "https://deno.land/x/isx@$VERSION/is_function.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isFunction(() => {}), true);
assertEquals(isFunction({}), false);

isObject

Whether the input is object or not.

import { isObject } from "https://deno.land/x/isx@$VERSION/is_object.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isObject({}), true);
assertEquals(isObject(null), false);

isSymbol

Whether the input is symbol or not.

import { isSymbol } from "https://deno.land/x/isx@$VERSION/is_symbol.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isSymbol(Symbol("symbol")), true);
assertEquals(isSymbol(null), false);

isNullable

Whether the input is null or undefined or not.

import { isNullable } from "https://deno.land/x/isx@$VERSION/is_nullable.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isNullable(null), true);
assertEquals(isNullable(undefined), true);
assertEquals(isNullable({}), false);

isPrimitive

Whether the input is Primitive or not.

import { isPrimitive } from "https://deno.land/x/isx@$VERSION/is_primitive.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isPrimitive(true), true);
assertEquals(isPrimitive(() => {}), false);

type Primitive =
  | number
  | string
  | boolean
  | bigint
  | undefined
  | null
  | symbol;

isPromise

Whether the input is Promise or not.

import { isPromise } from "https://deno.land/x/isx@$VERSION/is_promise.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isPromise(Promise.resolve()), true);
assertEquals(isPromise({}), false);

isDate

Whether the input is Date or not.

import { isDate } from "https://deno.land/x/isx@$VERSION/is_date.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isDate(new Date()), true);
assertEquals(isDate({}), false);

isError

Whether the input is Error or not.

import { isError } from "https://deno.land/x/isx@$VERSION/is_error.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isError(Error()), true);
assertEquals(isError(new SyntaxError()), true);
assertEquals(isError(new Date()), false);

isIterable

Whether the input is Iterable or not.

import { isIterable } from "https://deno.land/x/isx@$VERSION/is_iterable.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isIterable(""), true);
assertEquals(isIterable({}), false);

isAsyncIterable

Whether the input is AsyncIterable or not.

import { isAsyncIterable } from "https://deno.land/x/isx@$VERSION/is_async_iterable.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(
  isAsyncIterable({
    async *[Symbol.asyncIterator]() {
      yield "hello";
    },
  }),
  true,
);
assertEquals(isAsyncIterable(() => {}), false);

isRegExp

Whether the input is RegExp of not.

import { isRegExp } from "https://deno.land/x/isx@$VERSION/is_reg_exp.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isRegExp(new RegExp("")), true);
assertEquals(isRegExp({}), false);

Number subtypes

Validates a subtype of number. All validate functions must satisfy ⊂ number.

isOdd

Whether the input is odd or not.

import { isOdd } from "https://deno.land/x/isx@$VERSION/number/is_odd.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isOdd(1), true);
assertEquals(isOdd(0), false);

isEven

Whether the input is even or not.

import { isEven } from "https://deno.land/x/isx@$VERSION/number/is_even.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isEven(0), true);
assertEquals(isEven(1), false);

isPositiveNumber

Whether the input is positive number or not.

import { isPositiveNumber } from "https://deno.land/x/isx@$VERSION/number/is_positive_number.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isPositiveNumber(1), true);
assertEquals(isPositiveNumber(0), false);

isNonPositiveNumber

Whether the input is non-positive number or not. Non-positive number means less than or equal to zero.

import { isNonPositiveNumber } from "https://deno.land/x/isx@$VERSION/number/is_non_positive_number.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isNonPositiveNumber(0), true);
assertEquals(isNonPositiveNumber(-1), true);
assertEquals(isNonPositiveNumber(1), false);

isNegativeNumber

Whether the input is negative number or not.

import { isNegativeNumber } from "https://deno.land/x/isx@$VERSION/number/is_negative_number.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isNegativeNumber(-1), true);
assertEquals(isNegativeNumber(0), false);

isNonNegativeNumber

Whether the input is non-negative number or not. Non-negative number means greater than or equal to zero.

import { isNonNegativeNumber } from "https://deno.land/x/isx@$VERSION/number/is_non_negative_number.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isNonNegativeNumber(0), true);
assertEquals(isNonNegativeNumber(1), true);
assertEquals(isNonNegativeNumber(-1), false);

isNonNegativeInteger

Whether the input is non negative integer or not.

import { isNonNegativeInteger } from "https://deno.land/x/isx@$VERSION/number/is_non_negative_integer.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isNonNegativeInteger(0), true);
assertEquals(isNonNegativeInteger(1.0), true);
assertEquals(isNonNegativeInteger(-1), false);

Date subtypes

Validates a subtype of Date. All validate functions must satisfy ⊂ Date.

isValidDate

Whether the input is valid Date or not.

import { isValidDate } from "https://deno.land/x/isx@$VERSION/date/is_valid_date.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
assertEquals(isValidDate(new Date("2000/1/1")), true);
assertEquals(isValidDate(new Date("invalid")), false);

Where is mod?

There is no single entry point such as mod.

This prevents the inclusion of many unnecessary modules.

License

Released under the MIT license