goutil 有将对象数组，指定对象的某个字段转成该字段数组的方法吗？

This issue has been created since 2022-10-27.

因为是从Java转过来的，习惯于stream一些集合操作，在goutil中找到了Find，FindOrDefault，TakeWhile等方法
想问一下有没有取对象数组每一个对象的某个字段，然后转成数组的方法？
和java的 list.stream.map(Product::getXXX) 相似

kuunnss wrote this answer on 2022-10-30

orders := make([]Order, 2)
orders[0] = Order{name: "lisi", age: 18}
orders[1] = Order{name: "wang", age: 24}
输出 string数组 ["listi","wang"]

wenccc wrote this answer on 2022-11-06

func arrayColumn[T any, V any](s []T, callback func(val T) (target V, find bool)) []V {
	res := make([]V, 0)
	for _, v := range s {
		target, find := callback(v)
		if find {
			res = append(res, target)
		}
	}
	return res
}

inhere wrote this answer on 2022-11-10

thanks @wenccc !

@kuunnss 已经新增方法：

goutil/arrutil/collection_gte118.go

Lines 5 to 20 in 3f1a328

 // Map an object list [object0{},object1{},...] to flatten list [object0.someKey, object1.someKey, ...] 

 func Map[T any, V any](list []T, mapFn func(obj T) (val V, find bool)) []V { 

 flatArr := make([]V, 0, len(list)) 

 for _, obj := range list { 

 if target, find := mapFn(obj); find { 

 flatArr = append(flatArr, target) 

 } 

 } 

 return flatArr 

 } 

 // Column alias of Map func 

 func Column[T any, V any](list []T, mapFn func(obj T) (val V, find bool)) []V { 

 return Map(list, mapFn) 

 }

下个版本发布

inhere wrote this answer on 2022-11-29

已发布 https://github.com/gookit/goutil/releases/tag/v0.6.0

More Details About Repo

Owner Name	gookit
Repo Name	goutil
Full Name	gookit/goutil
Language	Go
Created Date	2018-07-03
Updated Date	2023-03-22
Star Count	1263
Watcher Count	29
Fork Count	142
Issue Count	3

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	// Map an object list [object0{},object1{},...] to flatten list [object0.someKey, object1.someKey, ...]
	func Map[T any, V any](list []T, mapFn func(obj T) (val V, find bool)) []V {
	flatArr := make([]V, 0, len(list))

	for _, obj := range list {
	if target, find := mapFn(obj); find {
	flatArr = append(flatArr, target)
	}
	}
	return flatArr
	}

	// Column alias of Map func
	func Column[T any, V any](list []T, mapFn func(obj T) (val V, find bool)) []V {
	return Map(list, mapFn)
	}