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  • isNotDefined()
  • Generic type variables
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  • Return type
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isNotDefined()

PreviousisNotBoolean()NextisNotFunction()

Last updated 3 years ago

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isNotDefined()

Checks if the is not the type obtained from its equal to 'undefined', not an type and is not equal to .

is-not-defined.func.ts
const isNotDefined = <Type, Payload extends object = object>(
  value: Type,
  callback: ResultCallback<Type, Payload> = resultCallback,
  payload?: Payload
): value is Undefined<Type> =>
  callback(
    typeOf(value) === 'undefined' &&
      typeof value === 'undefined' &&
      value === undefined,
    value,
    payload
  );

Generic type variables

Type

A generic type variable Type indicates the captured type of the given via the value is Undefined<Type> and the parameter of the provided function type.

Payloadextendsobject=object

Parameters

value: Type

callback: ResultCallback<Type, Payload>

payload?: Payload

Return type

value is Undefined<Type>

Returns

Example usage

// Example usage.
import { isNotDefined } from '@angular-package/type';

const anyUndefined: any = undefined;
const firstName = undefined;
const surname = 'My last name ';

isNotDefined(anyUndefined); // true; return type is `value is any`
isNotDefined(firstName); // true;  return type is `value is undefined`
isNotDefined(surname); // false; return type is `value is never`

The Payload generic type variable constrained by indicates the type of optional parameter of the supplied function and optional parameter of the function from which it captures its value.

The value of generic type variable , by default of the type captured from itself to check.

A callback function of type with parameters, the that has been checked, the of this check, and of generic type variable with optional properties from the provided , to handle them before the return. By default, it uses function.

An optional of the generic type variable is assigned to the of the given function.

The return type is a as the result of its statement indicating the is a generic type that takes a generic type variable by default of value captured from the supplied which changes to on the captured type .

The return value is a indicating whether the is not defined, is .

Type
boolean
Undefined
never
undefined
value
Type
value
boolean
undefined
value
object class
undefined
undefined
ResultCallback
value
value
return type
callback
object
callback
payload
isNotDefined()
ResultCallback
resultCallback()
value
Payload
payload
object
Payload
callback
value
payload
result
payload
result
payload