jpitchardu

Keybase proof

I hereby claim:

• I am pichardoj on github.
• I am jpichardo (https://keybase.io/jpichardo) on keybase.
• I have a public key ASCQ75Bt6nqP1GB6T-CVvSsWco0g48HHICv3uA9j0B5m-go

To claim this, I am signing this object:

jpitchardu

function optionalAccess(obj, path, def) {
  const propNames = path.replace(/\]|\)/, "").split(/\.|\[|\(/);

  return propNames.reduce((acc, prop) => acc[prop] || def, obj);
}

function proxyOptional(obj, evalFunc, def) {
  const handler = {
    get: function(target, prop, receiver) {
      const res = Reflect.get(...arguments);

jpitchardu

const evaluation = obj && obj.prop1 && obj.prop1.prop2 && obj.prop1.prop2.prop3;

console.log( evaluation != null ? evaluation : "SomeDefaultValue" );

jpitchardu

SomeClass object;

Optional.ofNullable(object)
  .map(obj -> obj.prop1)
  .map(obj -> obj.prop2)
  .map(obj -> obj.prop3)
  .orElse("SomeDefaultValue");

jpitchardu

val object: SomeClass?

object?.prop1?.prop2?.prop3 ?: "SomeDefaultValue";

jpitchardu

const evaluation = obj && obj.prop1 && obj.prop1.prop2 && obj.prop1.prop2.prop3;

console.log( evaluation != null ? evaluation : "SomeDefaultValue" ); // => "SomeDefaultValue"

jpitchardu

SomeClass obj;

obj?.prop1?.prop2?.prop3 ?? "SomeDefaultValue";

jpitchardu

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

jpitchardu

let obj;

console.log(obj && obj.someProp); // Prints undefined

jpitchardu

console.log( obj && obj.prop1 && obj.prop1.prop2 && obj.prop1.prop2.prop3 ); // => undefined