gutil

package
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 Go to latest Published: Mar 7, 2023 License: MIT Imports: 14 Imported by: 8

Documentation

Overview

Package gutil provides utility functions.

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

func ComparatorByte 

func ComparatorByte[T any](a, b T) int

ComparatorByte provides a basic comparison on byte.

func ComparatorFloat32 

func ComparatorFloat32[T any](a, b T) int

ComparatorFloat32 provides a basic comparison on float32.

func ComparatorFloat64 

func ComparatorFloat64[T any](a, b T) int

ComparatorFloat64 provides a basic comparison on float64.

func ComparatorInt 

func ComparatorInt[T any](a, b T) int

ComparatorInt provides a basic comparison on int.

func ComparatorInt16 

func ComparatorInt16[T any](a, b T) int

ComparatorInt16 provides a basic comparison on int16.

func ComparatorInt32 

func ComparatorInt32[T any](a, b T) int

ComparatorInt32 provides a basic comparison on int32.

func ComparatorInt64 

func ComparatorInt64[T any](a, b T) int

ComparatorInt64 provides a basic comparison on int64.

func ComparatorInt8 

func ComparatorInt8[T any](a, b T) int

ComparatorInt8 provides a basic comparison on int8.

func ComparatorRune 

func ComparatorRune[T any](a, b T) int

ComparatorRune provides a basic comparison on rune.

func ComparatorString 

func ComparatorString[T any](a, b T) int

ComparatorString provides a fast comparison on strings.

func ComparatorTime 

func ComparatorTime[T any](a, b T) int

ComparatorTime provides a basic comparison on time.Time.

func ComparatorUint 

func ComparatorUint[T any](a, b T) int

ComparatorUint provides a basic comparison on uint.

func ComparatorUint16 

func ComparatorUint16[T any](a, b T) int

ComparatorUint16 provides a basic comparison on uint16.

func ComparatorUint32 

func ComparatorUint32[T any](a, b T) int

ComparatorUint32 provides a basic comparison on uint32.

func ComparatorUint64 

func ComparatorUint64[T any](a, b T) int

ComparatorUint64 provides a basic comparison on uint64.

func ComparatorUint8 

func ComparatorUint8[T any](a, b T) int

ComparatorUint8 provides a basic comparison on uint8.

func Copy 

func Copy(src interface{}) (dst interface{})

Copy returns a deep copy of v.

Copy is unable to copy unexported fields in a struct (lowercase field names). Unexported fields can't be reflected by the Go runtime and therefore they can't perform any data copies.

func Dump 

func Dump(values ...interface{})

Dump prints variables `values` to stdout with more manually readable.

func DumpTo 

func DumpTo(writer io.Writer, value interface{}, option DumpOption)

DumpTo writes variables `values` as a string in to `writer` with more manually readable

func DumpWithOption 

func DumpWithOption(value interface{}, option DumpOption)

DumpWithOption returns variables `values` as a string with more manually readable.

func DumpWithType 

func DumpWithType(values ...interface{})

DumpWithType acts like Dump, but with type information. Also see Dump.

func GetOrDefaultAny 

func GetOrDefaultAny(def interface{}, param ...interface{}) interface{}

GetOrDefaultAny checks and returns value according whether parameter `param` available. It returns `param[0]` if it is available, or else it returns `def`.

func GetOrDefaultStr 

func GetOrDefaultStr(def string, param ...string) string

GetOrDefaultStr checks and returns value according whether parameter `param` available. It returns `param[0]` if it is available, or else it returns `def`.

func IsEmpty 

func IsEmpty(value interface{}) bool

IsEmpty checks given `value` empty or not. It returns false if `value` is: integer(0), bool(false), slice/map(len=0), nil; or else returns true.

func ItemValue 

func ItemValue(item interface{}, key interface{}) (value interface{}, found bool)

ItemValue retrieves and returns its value of which name/attribute specified by `key`. The parameter `item` can be type of map/*map/struct/*struct.

func Keys 

func Keys(mapOrStruct interface{}) (keysOrAttrs []string)

Keys retrieves and returns the keys from given map or struct.

func ListItemValues 

func ListItemValues(list interface{}, key interface{}, subKey ...interface{}) (values []interface{})

ListItemValues retrieves and returns the elements of all item struct/map with key `key`. Note that the parameter `list` should be type of slice which contains elements of map or struct, or else it returns an empty slice.

The parameter `list` supports types like: []map[string]interface{} []map[string]sub-map []struct []struct:sub-struct Note that the sub-map/sub-struct makes sense only if the optional parameter `subKey` is given.

func ListItemValuesUnique 

func ListItemValuesUnique(list interface{}, key string, subKey ...interface{}) []interface{}

ListItemValuesUnique retrieves and returns the unique elements of all struct/map with key `key`. Note that the parameter `list` should be type of slice which contains elements of map or struct, or else it returns an empty slice.

func ListToMapByKey 

func ListToMapByKey(list []map[string]interface{}, key string) map[string]interface{}

ListToMapByKey converts `list` to a map[string]interface{} of which key is specified by `key`. Note that the item value may be type of slice.

func MapContains 

func MapContains(data map[string]interface{}, key string) (ok bool)

MapContains checks whether map `data` contains `key`.

func MapContainsPossibleKey 

func MapContainsPossibleKey(data map[string]interface{}, key string) bool

MapContainsPossibleKey checks if the given `key` is contained in given map `data`. It checks the key ignoring cases and symbols.

Note that this function might be of low performance.

func MapCopy 

func MapCopy(data map[string]interface{}) (copy map[string]interface{})

MapCopy does a shallow copy from map `data` to `copy` for most commonly used map type map[string]interface{}.

func MapDelete 

func MapDelete(data map[string]interface{}, keys ...string)

MapDelete deletes all `keys` from map `data`.

func MapMerge 

func MapMerge(dst map[string]interface{}, src ...map[string]interface{})

MapMerge merges all map from `src` to map `dst`.

func MapMergeCopy 

func MapMergeCopy(src ...map[string]interface{}) (copy map[string]interface{})

MapMergeCopy creates and returns a new map which merges all map from `src`.

func MapOmitEmpty 

func MapOmitEmpty(data map[string]interface{})

MapOmitEmpty deletes all empty values from given map.

func MapPossibleItemByKey 

func MapPossibleItemByKey(data map[string]interface{}, key string) (foundKey string, foundValue interface{})

MapPossibleItemByKey tries to find the possible key-value pair for given key ignoring cases and symbols.

Note that this function might be of low performance.

func MapToSlice 

func MapToSlice(data interface{}) []interface{}

MapToSlice converts map to slice of which all keys and values are its items. Eg: {"K1": "v1", "K2": "v2"} => ["K1", "v1", "K2", "v2"]

func SliceCopy 

func SliceCopy(slice []interface{}) []interface{}

SliceCopy does a shallow copy of slice `data` for most commonly used slice type []interface{}.

func SliceDelete 

func SliceDelete(slice []interface{}, index int) (newSlice []interface{})

SliceDelete deletes an element at `index` and returns the new slice. It does nothing if the given `index` is invalid.

func SliceInsertAfter 

func SliceInsertAfter(slice []interface{}, index int, values ...interface{}) (newSlice []interface{})

SliceInsertAfter inserts the `values` to the back of `index` and returns a new slice.

Example 
package main

import (
	"fmt"
	"github.com/wowqhb/gf/v2/frame/g"
	"github.com/wowqhb/gf/v2/util/gutil"
)

func main() {
	s1 := g.Slice{
		0, 1, 2, 3, 4,
	}
	s2 := gutil.SliceInsertAfter(s1, 1, 8, 9)
	fmt.Println(s1)
	fmt.Println(s2)

}

Output:

[0 1 2 3 4]
[0 1 8 9 2 3 4]

func SliceInsertBefore 

func SliceInsertBefore(slice []interface{}, index int, values ...interface{}) (newSlice []interface{})

SliceInsertBefore inserts the `values` to the front of `index` and returns a new slice.

Example 
package main

import (
	"fmt"
	"github.com/wowqhb/gf/v2/frame/g"
	"github.com/wowqhb/gf/v2/util/gutil"
)

func main() {
	s1 := g.Slice{
		0, 1, 2, 3, 4,
	}
	s2 := gutil.SliceInsertBefore(s1, 1, 8, 9)
	fmt.Println(s1)
	fmt.Println(s2)

}

Output:

[0 1 2 3 4]
[0 8 9 1 2 3 4]

func SliceToMap 

func SliceToMap(slice interface{}) map[string]interface{}

SliceToMap converts slice type variable `slice` to `map[string]interface{}`. Note that if the length of `slice` is not an even number, it returns nil. Eg: ["K1", "v1", "K2", "v2"] => {"K1": "v1", "K2": "v2"} ["K1", "v1", "K2"] => nil

func SliceToMapWithColumnAsKey 

func SliceToMapWithColumnAsKey(slice interface{}, key interface{}) map[interface{}]interface{}

SliceToMapWithColumnAsKey converts slice type variable `slice` to `map[interface{}]interface{}` The value of specified column use as the key for returned map. Eg: SliceToMapWithColumnAsKey([{"K1": "v1", "K2": 1}, {"K1": "v2", "K2": 2}], "K1") => {"v1": {"K1": "v1", "K2": 1}, "v2": {"K1": "v2", "K2": 2}} SliceToMapWithColumnAsKey([{"K1": "v1", "K2": 1}, {"K1": "v2", "K2": 2}], "K2") => {1: {"K1": "v1", "K2": 1}, 2: {"K1": "v2", "K2": 2}}

func StructToSlice 

func StructToSlice(data interface{}) []interface{}

StructToSlice converts struct to slice of which all keys and values are its items. Eg: {"K1": "v1", "K2": "v2"} => ["K1", "v1", "K2", "v2"]

func Throw 

func Throw(exception interface{})

Throw throws out an exception, which can be caught be TryCatch or recover.

func Try 

func Try(ctx context.Context, try func(ctx context.Context)) (err error)

Try implements try... logistics using internal panic...recover. It returns error if any exception occurs, or else it returns nil.

func TryCatch 

func TryCatch(ctx context.Context, try func(ctx context.Context), catch ...func(ctx context.Context, exception error))

TryCatch implements try...catch... logistics using internal panic...recover. It automatically calls function `catch` if any exception occurs and passes the exception as an error.

func Values 

func Values(mapOrStruct interface{}) (values []interface{})

Values retrieves and returns the values from given map or struct.

Types

type Comparator 

type Comparator func(a, b interface{}) int

Comparator is a function that compare a and b, and returns the result as int.

Should return a number: 

negative , if a < b
zero     , if a == b
positive , if a > b

type DumpOption 

type DumpOption struct {
	WithType     bool // WithType specifies dumping content with type information.
	ExportedOnly bool // Only dump Exported fields for structs.
}

DumpOption specifies the behavior of function Export.

type OriginTypeAndKindOutput 

type OriginTypeAndKindOutput = reflection.OriginTypeAndKindOutput

func OriginTypeAndKind 

func OriginTypeAndKind(value interface{}) (out OriginTypeAndKindOutput)

OriginTypeAndKind retrieves and returns the original reflect type and kind.

type OriginValueAndKindOutput 

type OriginValueAndKindOutput = reflection.OriginValueAndKindOutput

func OriginValueAndKind 

func OriginValueAndKind(value interface{}) (out OriginValueAndKindOutput)

OriginValueAndKind retrieves and returns the original reflect value and kind.

Source Files

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