README.md

lutils

Some commonly used tools in development

dfo

The name "dfo" is derived from the homophonic sound of "default".

This package can safely load pointer values and replace empty pointers with default values.

go get -u  github.com/liang09255/lutils/dfo

Example:

nums1, nums2 := 1, 1
addTwoNum := func(a *int, b *int) int {
    // This is a service which can add two numbers
    return dfo.IntPtr(a) + dfo.IntPtr(b)
}
addTwoNum(nil, nil)       // 0 dfo turn nil to 0
addTwoNum(&nums1, nil)    // 1
addTwoNum(nil, &nums2)    // 1
addTwoNum(&nums1, &nums2) // 2

Without dfo, we will implement the function like this, dfo can make the code look cleaner

addTwoNum := func(a *int, b *int) int {
	num1, num2 := 0, 0
	if a != nil {
		num1 = *a 
	}
	if b != nil {
		num2 = *b
	}
	return num1 + num2
}

conv

This package can convert the type of a variable to another type.

We can use conv.SetLogger to set logger, conv will automatically collect errors into logger

go get -u  github.com/liang09255/lutils/conv

Example:

str := "1.0"
i1 := conv.ToInt(str) // 1 (int)
ui1 := conv.ToUint(str) // 1 (uint)
f1 := conv.ToFloat64(str) // 1 (float64)

str = "true"
b := conv.ToBool(str) // true (bool)

m := map[string]string{"a": "b"}
jsonContent := conv.ToJSON(m) // {"a":"b"}

arr := []string{"a", "b", "c"}
m1 := conv.ArrayToMap(arr) // map[a:{} b:{} c:{}]
_, ok1 := m1["a"] // ok1 => true
_, ok2 := m1["d"] // ok2 => false
m2 := conv.ArrayToBoolMap(arr)
ok3 := m2["a"] // true
ok4 := m2["d"] // false

// use logger
conv.SetLogger(Logger)
// 	logger need to implement interface Logger
// 	type Logger interface {
// 		Info(args ...interface{})
//		Warn(args ...interface{})
//		Error(args ...interface{})
//	}