I'm facing an issue with my map function where it is not waiting for the request response before moving on to the next index.
this.products = [];
productList.map((product) => {
this.productService.getProductInfo(product).subscribe(productData => {
productData.selected = true;
this.products.push(productData);
});
});
Is there a way to make the map function wait for the request response?
To start, create an array of requests:
const productRequests: Observable<Product>[] = productList.map(productId => this.productService.getProductInfo(productId));
Next, to combine the observables, there are a few ways to do it while preserving the order:
// Loads all at once, preserves order
forkJoin(...productRequests).subscribe(productData => {
this.products = productData;
});
or
// Loads one by one, sorts post result to preserve order
this.products = [];
merge(...productRequests).subscribe(productData => {
this.products.push(productData);
this.products.sort((a, b) => {
if (a.id < b.id) {
return -1
}
if (a.id > b.id) {
return 1
}
return 0;
});
});
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