This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
func ConnectToDB() result.Result[sql.DB] { | |
psqlInfo := fmt.Sprintf("host=%s port=%s user=%s password=%s dbname=%s sslmode=disable", host, port, user, password, dbname) | |
return result.NewResult(sql.Open("postgres", psqlInfo)).Try(func(db *sql.DB) error { | |
return db.Ping() | |
}).IfOk(func() { | |
fmt.Println("Successfully connected to database!") | |
}) | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
obj?.arrayProp?[0]?.someProp?.someFunc?.(); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function optional(obj, evalFunc, def) { | |
const handler = { | |
get: function(target, prop, receiver) { | |
const res = Reflect.get(...arguments); | |
return typeof res === "object" ? proxify(res) : res != null ? res : def; | |
} | |
}; | |
const proxify = target => { | |
return new Proxy(target, handler); | |
}; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
var object = { 'a': [{ 'b': { 'c': 3 } }] }; | |
_.get(object, 'a[0].b.c'); // => 3 | |
_.get(object, ['a', '0', 'b', 'c']); // => 3 | |
_.get(object, 'a.b.c', 'default'); // => 'default' |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function optionalAccess(obj, path, def) { | |
const propNames = path.replace(/\]|\)/, "").split(/\.|\[|\(/); | |
return propNames.reduce((acc, prop) => acc[prop] || def, obj); | |
} | |
const obj = { | |
items: [ | |
{ hello: "Hello" } | |
] | |
}; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function optionalAccess(obj, path, def) { | |
const propNames = path.replace(/\]|\)/, "").split(/\.|\[|\(/); | |
return propNames.reduce((acc, prop) => acc[prop] || def, obj); | |
} | |
const obj = { | |
items: [ | |
{ hello: "Hello" } | |
] | |
}; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
console.log( obj && obj.prop1 && obj.prop1.prop2 && obj.prop1.prop2.prop3 ); // => undefined |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
let obj; | |
console.log(obj && obj.someProp); // Prints undefined |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
let obj; | |
console.log(obj.someProp); // => TypeError: Cannot read property 'someProp' of undefined | |
obj = null; | |
console.log(obj.someProp); // => TypeError: Cannot read property 'someProp' of null |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
SomeClass obj; | |
obj?.prop1?.prop2?.prop3 ?? "SomeDefaultValue"; |
NewerOlder