github.com/aacfactory/fns@v1.2.85/commons/operators/filter.go (about)

     1  /*
     2   * Copyright 2023 Wang Min Xiang
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   * 	http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   *
    16   */
    17  
    18  package operators
    19  
    20  import "context"
    21  
    22  func Filter[T any](ctx context.Context, array []T, fn func(context.Context, T) (bool, error)) (r []T, err error) {
    23  	r = make([]T, 0, 1)
    24  	if array == nil || len(array) == 0 {
    25  		return
    26  	}
    27  	for _, e := range array {
    28  		found, findErr := fn(ctx, e)
    29  		if findErr != nil {
    30  			err = findErr
    31  			return
    32  		}
    33  		if found {
    34  			r = append(r, e)
    35  		}
    36  	}
    37  	return
    38  }