lang

getType

getType(value)

Return the type of value.

Since

0.14.0

Arguments

• value (any)

Return

• (string)

Example

getType(undefined)
// => 'Undefined'
getType(null)
// => 'Null'
getType(1)
// => 'Number'
getType(true)
// => 'Boolean'
getType('')
// => 'String'
getType(Symbol('foo'))
// => 'Symbol'
getType(0n)
// => 'BigInt'
getType({})
// => 'Object'
getType([])
// => 'Array'
getType(/\s/)
// => 'RegExp'
getType(new Date())
// => 'Date'
getType(function () {})
// => 'Function'

isArray

isArray(value)

Check if a value is an Array.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isArray([])
// => true

isBigInt

isBigInt(value)

Check if a value is a BigInt value.

Since

0.8.0

Arguments

• value (any)

Return

• (boolean)

Example

isBigInt(BigInt(1));
// => true

isBoolean

isBoolean(value)

Check if a value is a Boolean.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isBoolean(true);
// => true

isDate

isDate(value)

Check if a value is a Date object.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isDate([]);
// => true

isError

isError(value)

Check if a value is an Error object.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isError(new Error('error message'));
// => true

isFunction

isFunction(value)

Check if a value is a function, including generator function and async function.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isFunction(function () {});
// => true

isFunction(function* () {});
// => true

isNil

isNil(value)

Check if a value is null or undefined.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isNil(null);
// => true
isNil(undefined);
// => true

isNull

isNull(value)

Check if a value is null

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isNull(null);
// => true

isNumber

isNumber(value)

Check if a value is a Number.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isNumber(1);
// => true

isObject

isObject(value)

Check if a value is an Object.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isObject({});
// => true
isObject(null);
// => false

isRegExp

isRegExp(value)

Check if a value is a RegExp object.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isRegExp(/\s+/);
// => true

isString

isString(value)

Check if a value is a String.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isString('hello world');
// => true

isSymbol

isSymbol(value)

Check if a value is a Symbol value.

Since

0.8.0

Arguments

• value (any)

Return

• (boolean)

Example

isSymbol(Symbol('foo'));
// => true

isUndefined

isUndefined(value)

Check if a value is undefined.

Since

0.1.0

Arguments

• value (any)

Return

• (boolean)

Example

isUndefined(void 0);
// => true