I would like to get firstName
and lastName
properties from a whole user
object. I need to use a conditional statement too. How to do something like that?
getUserById(id)
and getUserByAddress(id)
use the JavaScript find()
method that returns an element or undefined
.
let { firstName, lastName } = getUserById(id);
if ({ firstName, lastName } === undefined) {
{ firstName, lastName } = getUserByAddress(id);
}
return `${firstName} ${lastName}`;
const { firstName, lastName } = getUserById(id) || getUserByAddress(id) || {};
if (firstName && lastName) {
return `${firstName} ${lastName}`;
}
return "Unknown user";
If getUserById(id)
is falsy, getUserByAddress(id)
will be executed. If this is falsy, too, {}
will at least prevent throwing an error.
const episodeParser = (
query: string, codeType ?: string, productId?: number, newProductId?: number
) => {
let queryParams = {
query,
codeType,
processId : AppConfig.PROCESS_ID,
...(productId && {productId}),
...(newProductId && {newProductId})
};
return queryParams;
}
Here, productId
and newProductId
both are optional, whatever the value of id will be there, these key will be getting in queryParams.
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