Leon Mika
4b4d515ade
- Added the between operator to query expressions. - Added the using query expression suffix to specify which index to query (or force a scan). This is required if query planning has found multiple indices that can potentially be used. - Rewrote the types of the query expressions to allow for functions to be defined once, and be useful in queries that result in DynamoDB queries, and evaluation. - Added some test functions around time and summing numbers. - Fixed a bug in the del-attr which was not honouring marked rows in a similar way to set-attr: it was only deleting attributes from the first row. - Added the -to type flag to set-attr which will set the attribute to the value of a query expression.
61 lines
1 KiB
Go
61 lines
1 KiB
Go
package sliceutils
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func All[T any](ts []T, predicate func(t T) bool) bool {
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for _, t := range ts {
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if !predicate(t) {
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return false
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}
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}
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return true
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}
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func Map[T, U any](ts []T, fn func(t T) U) []U {
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us := make([]U, len(ts))
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for i, t := range ts {
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us[i] = fn(t)
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}
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return us
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}
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func MapWithError[T, U any](ts []T, fn func(t T) (U, error)) ([]U, error) {
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us := make([]U, len(ts))
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for i, t := range ts {
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var err error
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us[i], err = fn(t)
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if err != nil {
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return nil, err
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}
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}
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return us, nil
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}
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func Filter[T any](ts []T, fn func(t T) bool) []T {
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us := make([]T, 0)
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for _, t := range ts {
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if fn(t) {
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us = append(us, t)
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}
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}
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return us
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}
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func FindFirst[T any](ts []T, fn func(t T) bool) (returnedT T, found bool) {
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for _, t := range ts {
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if fn(t) {
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return t, true
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}
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}
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return returnedT, false
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}
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func FindLast[T any](ts []T, fn func(t T) bool) (returnedT T, found bool) {
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for i := len(ts) - 1; i >= 0; i-- {
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t := ts[i]
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if fn(t) {
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return t, true
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}
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}
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return returnedT, false
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}
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