javascript - Lodash _.result() default value - Stack Overflow

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Why doesn't lodash result method return the default value in this case?

Arguments object (Object): The object to query.

key (string): The key of the property to resolve.

[defaultValue] (*): The value returned if the property value resolves to undefined.

var result = _.result({ foo: 1 }, 'bar', 'default');

console.log(typeof _.result({ foo: 1 }, 'bar') === 'undefined') // true

console.log(result); // expected: 'default'

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Why doesn't lodash result method return the default value in this case?

Arguments object (Object): The object to query.

key (string): The key of the property to resolve.

[defaultValue] (*): The value returned if the property value resolves to undefined.

var result = _.result({ foo: 1 }, 'bar', 'default');

console.log(typeof _.result({ foo: 1 }, 'bar') === 'undefined') // true

console.log(result); // expected: 'default'

http://jsfiddle/dbvs5ney/

• javascript
• lodash

Share Improve this question Follow asked Feb 12, 2015 at 12:21 JohanJohan 35.2k6262 gold badges187187 silver badges305305 bronze badges 5

• Have you tried _.constant('default') like they've got in the example? – Andy Commented Feb 12, 2015 at 12:25
• @Andy No, I haven't. I'm using the busy example just above that as you can see. – Johan Commented Feb 12, 2015 at 12:30
• 1 I can get it to work in my browser with your code (that fiddle doesn't work for some reason). – Andy Commented Feb 12, 2015 at 12:40
• What version of lodash do you use? – Kiril Commented Feb 12, 2015 at 14:06
• @Kiril 2.2.1 as you see in the Fiddle – Johan Commented Feb 12, 2015 at 14:10

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2 Answers 2

Sorted by: Reset to default 6

Seems that the default parameter was added only in version 3.0.0
Compare the _.result implementation:
3.0.0 lodash.js

function result(object, key, defaultValue) {
  var value = object == null ? undefined : object[key];
  if (typeof value == 'undefined') {
    value = defaultValue;
  }
  return isFunction(value) ? value.call(object) : value;
}

And 2.2.1 lodash.js:

function result(object, property) {
  if (object) {
    var value = object[property];
    return isFunction(value) ? object[property]() : value;
  }
}

Try with newer lodash version, if you do not need specifically with version 2.2.1.

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