I have the following method that returns result as shown below:
result: [ { status: 200, ... }, { status: 200, ... }, { status: 400, ... }, ... ]
I need to group the result by using status value and return only 2 results instead of 3 for the example result above:
update() {
this.demoService.update(...).toPromise()
.then(result => {
const message = result.map((x: any) => {
if (x.status === 200) {
return {
text: 'successful'
};
} else {
return {
text: 'fail'
};
}
});
}
})
}
I tried to use groupBy of RxJs but I think it cannot be used in Promise. So, how can I group this result in the example above?
I'm not sure it works, but you can try (you filter only entities with distinct status, then select only statuses):
update() {
this.demoService.update(...).subscribe(result => {
const messages = result
.filter((x, i, arr) => arr.findIndex(t => t.status === x.status) === i)
.map(x => x.status);
// do stuff
});
}
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