CODEWITHSUNDEEP
iosswift
Hardik Baldha
Hardik Baldha

Reputation: 159

Is there any way to replace nested for-in loops

In my code i have nested query to fetch data and for that i have to go last level to fetch that value. for that i have to run for loop 4 time. instead of that is there any way in realm function to decrease this loop and access time?

var tax = 0.0
for item in items {
    for menuItem in item.itemOrderMenu {
        for customize in menuItem.menuSetItems {
            for custom in customize.customizationItems where custom.isSelected {
                tax += custom.taxAmount
            }
        }
    }
}

is there a better approach to access nested data?

Upvotes: 0

Views: 541

Answers (1)

Sweeper
Sweeper

Reputation: 271660

You could use a bunch of flatMap, followed by a filter and lastly a reduce:

let customisationItems = items.lazy.flatMap { $0.itemOrderMenu.lazy.flatMap { $0.menuSetItems.lazy.flatMap { $0.customisationItems } } }
let tax = es.filter { $0.isSelected }.reduce(0.0, { $0 + $1.taxAmount })

I don't think you can reduce the nesting of that anymore.

Upvotes: 1

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