What are your thoughts on this method? Verifying the existence of a variable or setting it to

const pictureEntity = updateUserDto?.picture

  ? await this.filesService.find(updateUserDto.picture)

  : null;

if (pictureEntity) {

  const url = await this.filesService.getFileUrl(pictureEntity);

}

Is the method used to assign the value to pictureEntity correct? In essence, if the property 'picture' is not defined, I'm avoiding using the find service in filesService as TypeORM may return a random value if 'picture' is null or undefined.

Initially, I attempted:

if (updateUserDto?.picture) {
  const pictureEntity = await this.filesService.find(updateUserDto.picture);
}

However, TypeScript flagged an error since I was declaring a variable within an If statement.

javascripttypescriptbest-fit

Answer №1

In order to assign a value to pictureEntity only when updateUserDto?.picture is set, your initial attempt was close but you just need to declare the variable outside of the if statement before assigning it a value like so

let pictureEntity;
if (updateUserDto?.picture) {
  pictureEntity = await this.filesService.find(updateUserDto.picture);
}

Remember to use let instead of const since you're changing the value of the variable after initialization. Also keep in mind that if updateUserDto?.picture evaluates to false, the default value of pictureEntity will be undefined

Answer №2

To achieve this, you can write the following code snippet:

const pictureEntity = updateUserDto?.picture && await this.filesService.find(updateUserDto.picture);

If updateUserDto is either null or undefined, then pictureEntity will also be undefined. Otherwise, it will await for another promise to get resolved.

Note:

Moreover, there's no necessity to use const in this context:

if (pictureEntity) {

  pictureEntity.url = await this.filesService.getFileUrl(pictureEntity);

}

You should not utilize const when assigning values to object properties.

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