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package internal |
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import ( |
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"reflect" |
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"github.com/gotilty/gotil/internal/errs" |
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) |
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// FindLastBy iterates over elements of collection, returns an object of lastest element predicate if returns true for. |
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// data := []int64{-100, -5, 30, 100} |
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// newData, _ := FindLastBy(data, func(val interface{}, i int) bool { |
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// if val.(int64) == 30 { |
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// return true |
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// } else { |
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// return false |
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// } |
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// }) |
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// // Output: 30 |
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func FindLastBy(a interface{}, f func(val interface{}, i int) bool) (interface{}, error) { |
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return FindLastByFromIndex(a, f, 0) |
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} |
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// FindLastBy iterates over elements of collection, returns an object of lastest element predicate if returns true for. |
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// It works same as FindLastBy just from parameter provides to set start index of given slice or array. |
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func FindLastByFromIndex(a interface{}, f func(val interface{}, i int) bool, from int) (interface{}, error) { |
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val := reflect.ValueOf(a) |
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switch val.Kind() { |
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case reflect.Slice, reflect.Array: |
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index := findLastIndex(val, f, 0) |
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if index > -1 { |
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return val.Index(index).Interface(), nil |
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} |
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return nil, nil |
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} |
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return nil, errs.NewUnsupportedTypeError(val.Kind().String()) |
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} |
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func findLastIndex(val reflect.Value, f func(val interface{}, i int) bool, from int) int { |
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length := val.Len() |
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if length == 0 { |
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return -1 |
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} |
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index := length - 1 |
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if from < 0 { |
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index = max(length+index, 0) |
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} else { |
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index = min(index, length-1) |
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} |
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return baseFindIndex(val, f, index, true) |
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} |
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func baseFindIndex(val reflect.Value, f func(val interface{}, i int) bool, from int, right bool) int { |
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length := val.Len() |
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index := from |
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if right { |
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for index < length { |
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value := val.Index(index) |
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if f(value.Interface(), index) { |
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return index |
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} |
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index-- |
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} |
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} else { |
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for index < length { |
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value := val.Index(index) |
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if f(value.Interface(), index) { |
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return index |
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} |
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index++ |
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} |
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} |
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return -1 |
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} |
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func max(a, b int) int { |
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if a > b { |
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return a |
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} |
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return b |
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} |
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func min(a, b int) int { |
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if a < b { |
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return a |
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} |
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return b |
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} |
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gotilty /
gotil
