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On this page
  • isStringType()
  • Generic type variables
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  • Return type
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  1. is

isStringType()

PreviousisStringObject()NextisSymbol()

Last updated 3 years ago

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isStringType()

Checks if value is a type.

is-string-type.func.ts
const isStringType = <Payload extends object>(
  value: any,
  callback: ResultCallback<any, Payload> = resultCallback,
  payload?: Payload
): value is string =>
  callback(typeof value === 'string', value, payload);

Generic type variables

Payloadextendsobject

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.

Parameters

value: any

The value of type to check.

callback: ResultCallback<any, Payload>

payload?: Payload

Return type

value is string

Returns

Example usage

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

isStringType('age'); // Returns `true` as `value is string`
isStringType(new String('age')) // Returns `false` as `value is string`

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.

The return value is a indicating whether the provided is a type.

boolean
boolean
string
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any
string
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any
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isStringType()
ResultCallback
resultCallback()
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Payload
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Payload
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