52 lines
956 B
Go
52 lines
956 B
Go
package stream
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import "runtime"
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// Filter 对任意数组操作，将不合格的元素踢出去
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func (s *Stream) Filter(predicate func(interface{}) bool) *Stream {
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ret := make([]interface{}, len(s.list))
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size := 0
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if s.isParallel {
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count := runtime.NumCPU()
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ch1 := make(chan interface{}, count)
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ch2 := make(chan interface{})
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for i := 0; i < count; i++ {
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go func() {
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for true {
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if value, ok := <-ch1; !ok {
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break
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} else {
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if predicate(value) {
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ch2 <- value
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} else {
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ch2 <- nil
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}
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}
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}
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}()
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}
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go func() {
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for _, v := range s.list {
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ch1 <- v
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}
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close(ch1)
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}()
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for i := 0; i < len(s.list); i++ {
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value := <-ch2
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if value != nil {
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ret[size] = value
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size++
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}
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}
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} else {
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for _, v := range s.list {
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if predicate(v) {
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ret[size] = v
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size++
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}
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}
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}
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s.list = ret[:size]
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return s
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}
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