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slice_helper.go
33 lines (31 loc) · 1.09 KB
/
slice_helper.go
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// Licensed to ClickHouse, Inc. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. ClickHouse, Inc. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package column
// difference returns the elements in `a` that aren't in `b`.
func difference(a, b []string) []string {
mb := make(map[string]struct{}, len(b))
for _, x := range b {
mb[x] = struct{}{}
}
var diff []string
for _, x := range a {
if _, found := mb[x]; !found {
diff = append(diff, x)
}
}
return diff
}