111 lines
2 KiB
Go
111 lines
2 KiB
Go
// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package fncs
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import (
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"context"
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)
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func difference(ctx context.Context, args ...interface{}) (interface{}, error) {
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d := make([]interface{}, 0)
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c := make(map[interface{}]int)
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for _, x := range args {
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a, _ := ensureSlice(x)
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for _, v := range a {
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c[v] += 1
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}
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}
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for k, b := range c {
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if b == 1 {
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d = append(d, k)
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}
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}
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return d, nil
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}
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func distinct(ctx context.Context, args ...interface{}) (interface{}, error) {
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d := make([]interface{}, 0)
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c := make(map[interface{}]bool)
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for _, x := range args {
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a, _ := ensureSlice(x)
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for _, v := range a {
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switch v := v.(type) {
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case []interface{}:
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for _, v := range v {
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c[v] = true
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}
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default:
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c[v] = true
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}
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}
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}
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for k := range c {
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d = append(d, k)
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}
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return d, nil
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}
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func intersect(ctx context.Context, args ...interface{}) (interface{}, error) {
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l := len(args)
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d := make([]interface{}, 0)
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c := make(map[interface{}]int)
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for _, x := range args {
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a, _ := ensureSlice(x)
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for _, v := range a {
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c[v] += 1
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}
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}
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for k, b := range c {
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if b == l {
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d = append(d, k)
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}
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}
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return d, nil
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}
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func union(ctx context.Context, args ...interface{}) (interface{}, error) {
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d := make([]interface{}, 0)
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c := make(map[interface{}]bool)
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for _, x := range args {
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a, _ := ensureSlice(x)
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for _, v := range a {
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c[v] = true
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}
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}
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for k := range c {
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d = append(d, k)
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}
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return d, nil
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}
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