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javascripttypescriptpromisees6-promise

Get a value from a Promise Typescript

One of function inside a typescript class returns a Promise<string>. How do I unwrap/yield the value inside that promise.

functionA(): Promise<string> {
   // api call returns Promise<string>
}

functionB(): string {
   return this.functionA() // how to unwrap the value inside this  promise
}
Solution

  • How do I unwrap/yield the value inside that promise

    You can do it with async/await.Don't be fooled into thinking that you just went from async to sync, async await it is just a wrapper around .then. 

    functionA(): Promise<string> {
   // api call returns Promise<string>
}

async functionB(): Promise<string> {
   const value = await this.functionA() // how to unwrap the value inside this  promise
   return value;
}

    Further