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How to use the extend function from lodash

Find comprehensive JavaScript lodash.extend code examples handpicked from public code repositorys.

lodash.extend is a function that copies properties from one or more source objects to a destination object, and returns the destination object.

jupyter-ros.js

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    //     this.viewer.scene.remove(this.view.points.sn);
    // }
});


var DepthCloudModel = widgets.WidgetModel.extend({
    defaults: _.extend(widget_defaults(), defaults.DepthCloudModelDefaults),
    initialize: function() {
        DepthCloudModel.__super__.initialize.apply(this, arguments);
        this.depth_cloud = new ROS3D.DepthCloud({
            url: this.get('url'),

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+ 197 other calls in file

reference.js

GitHub: akeneo/pim-api-docs

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                        highlightJs.highlight('json', JSON.stringify(example, null, 2), true);
                    response.hljsExample = '<pre class="hljs"><code>' + highlightjsExample.value + '</code></pre>';
                }
                return response;
            });
            data.categories[escapeCategory].resources[escapeTag].operations[operationId] = _.extend(operation, { verb: verb, path: pathUri, groupedParameters: groupedParameters });
        }
    });
});
return gulp.src('src/api-reference/reference.handlebars')

+ 15 other calls in file

How does lodash.extend work?

lodash.extend is a function that copies properties from one or more source objects to a destination object, and returns the destination object. When lodash.extend is called, it performs the following steps:

It takes one or more objects as arguments. The first object is the destination object, and any additional objects are the source objects.
For each source object, it iterates over its own properties and copies them to the destination object. If a property with the same name already exists on the destination object, its value is overwritten by the value from the source object.
Once all the properties from all the source objects have been copied to the destination object, the function returns the destination object.

Here's an example of how you could use lodash.extend to copy properties from a source object to a destination object:

javascript
const _ = require('lodash');

const source = {
  name: 'John Doe',
  age: 42,
  email: 'johndoe@example.com'
};

const destination = {
  name: 'Jane Doe',
  occupation: 'Developer'
};

_.extend(destination, source);

console.log(destination);

In this example, we're requiring the lodash package and importing the extend function from it.

We're then defining two objects: source and destination. destination has a few properties already defined, while source has some additional properties.

We're then calling _.extend with the destination object as the first argument, and the source object as the second argument. This will copy the properties from source to destination, overwriting any existing properties with the same names.

Finally, we're logging the destination object to the console. When we run this code, we'll get output that looks like this:

css
{ name: 'John Doe',
  occupation: 'Developer',
  age: 42,
  email: 'johndoe@example.com' }

As you can see, the properties from source have been copied to destination, overwriting the existing name property and adding the age and email properties. The occupation property from destination is still present because it didn't exist on source.

helpers.js

GitHub: gemini-testing/hermione

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    return testInfo;
};


exports.extendTestInfo = (test, opts) => {
    return _.extend(exports.getTestInfo(test), opts);
};


exports.formatFailedTests = (tests) => {
    const formattedTests = [];

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browser-options.js

GitHub: gemini-testing/hermione

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                    throw new Error('Each browser must have "desiredCapabilities" option');
                } else {
                    utils.assertOptionalObject(value, 'desiredCapabilities');
                }
            },
            map: (value, config) => _.extend({}, config.desiredCapabilities, value)
        })
    });
};

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+ 5 other calls in file

Ai Example

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const _ = require("lodash");

const source = { name: "John", age: 30 };
const destination = { name: "Jane", occupation: "Developer" };

const result = _.extend(destination, source);

console.log(result);

In this example, we're using lodash.extend to copy properties from the source object to the destination object. We're also logging the result of the function call to the console. When we run this code, we'll get output that looks like this: css Copy code

main.js

GitHub: compdemocracy/polis

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  location.reload();
});


eb.on(eb.reloadWithMoreParams, function(params) {
  var existingParams = encodedParams ? Utils.decodeParams(encodedParams) : {};
  var combinedParams = _.extend({}, existingParams, params);
  var ep = Utils.encodeParams(combinedParams);
  if (!combinedParams || 0 === _.keys(combinedParams).length) {
    ep = "";
  }

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+ 3 other calls in file

middlewares.js

GitHub: Pythagora-io/pythagora

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let timestamp = new Date(request.createdAt).getTime();
const originalFunction = patchJwtVerify(timestamp);

pythagora.RedisInterceptor.setIntermediateData(request.intermediateData);
let reqId = pythagora.idSeq++;
pythagora.testingRequests[reqId] = _.extend({
    mongoQueriesTest: 0,
    errors: []
}, request);

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+ 2 other calls in file

mongoose.js

GitHub: Pythagora-io/pythagora

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    conditions = self._conditions || self._doc;

if (isQuery) {
    collection = _.get(self, '_collection.collectionName');
    query = jsonObjToMongo(conditions);
    req = _.extend({collection}, _.pick(self, ['op', 'options', '_conditions', '_fields', '_update', '_path', '_distinct', '_doc']));
} else if (isModel) {
    op = self.$op || self.$__.op;
    if (op !== 'validate') conditions = _.pick(self._doc, '_id');
    query = jsonObjToMongo(conditions)

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index.js

GitHub: IMA-WorldHealth/bhima

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 * The HTTP interface which actually creates the report.
 */
async function report(req, res, next) {
  try {
    const qs = _.clone(req.query);
    _.extend(qs, { filename : 'REPORT.CLIENT_SUMMARY.TITLE' });


    const groupUuid = db.bid(req.query.group_uuid);
    const showDetails = parseInt(req.query.shouldShowDebtsDetails, 10);
    const metadata = _.clone(req.session);

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utils.js

GitHub: mingdaocom/pd-openweb

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    console.log(base, relativePath);
    throw new Error('传入的路径参数不合法');
  }
}
function notify(title, message, isError, extra) {
  var options = _.extend({}, extra, {
    sound: isError,
    icon: isError
      ? path.join(require.resolve('gulp-notify'), '..', 'assets', 'gulp-error.png')
      : path.join(require.resolve('gulp-notify'), '..', 'assets', 'gulp.png'),

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lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.escapeRegExp        = _.escapeRegExp;
module.exports.every               = _.every;
module.exports.exists              = _.exists;
module.exports.existsAll           = _.existsAll;
module.exports.explode             = _.explode;
module.exports.extend              = _.extend;
module.exports.extendWith          = _.extendWith;
module.exports.falsey              = _.falsey;
module.exports.falseyAll           = _.falseyAll;
module.exports.fill                = _.fill;

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packet.js

GitHub: node-lifx/lifx-lan-client

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if (obj.type !== undefined) {
  const typeName = result(find(this.typeList, {id: obj.type}), 'name');
  if (packets[typeName] !== undefined) {
    if (typeof packets[typeName].toObject === 'function') {
      const specificObj = packets[typeName].toObject(buf.slice(constants.PACKET_HEADER_SIZE));
      obj = extend(obj, specificObj);
    }
  }
}

loader.js

GitHub: learnfwd/lfa

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    releaseBuildPath: path.join(dotPath, 'build', 'release'),
    debugBuildPath: path.join(dotPath, 'build', 'debug'),
    tmpPath: path.resolve(dotPath, 'build', 'tmp'),
  };
    
  return _.extend(config, r);
})
.catch(function (err) {
  if (!error) { error = err; }

repository.js

GitHub: firespring/givesource

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return new Promise(function (resolve, reject) {
  params = params || {}
  if (!repository.table) {
    reject(new Error('Repository table undefined'))
  }
  params = _.extend({}, { TableName: repository.table }, params)
  repository.dbClient.scan(params, function (err, data) {
    if (err) {
      reject(new Error(err, 'DynamoDB'))
    }

+ 2 other calls in file

index.js

GitHub: bitfinexcom/grenache-nodejs-link

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    requestTimeout: 2500,
    lruMaxSizeLookup: 2500,
    lruMaxAgeLookup: 10000
  }

  _.extend(this.conf, conf)
}

init () {
  this._inited = true

jsHarmony.LoadModels.js

GitHub: apHarmony/jsharmony

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      lastkey = key;
      let xval = parseObject(obj[key]);
      if(xval) obj[key] = xval();
    }
    if((numkeys==1) && (lastkey in macroids)){
      return function(){ return _.extend({},evalMacro(macros[lastkey.substr(1)]),obj[lastkey]); };
    }
  }
}
parseObject(_this.Config);

+ 11 other calls in file

fieldsAnt.cjs.js

GitHub: mighty-justice/fields-ant

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  fieldErrors = utils.mapBooleanToText(fieldErrors);
}

if (lodash.isPlainObject(fieldErrors)) {
  // If an object, recurse
  lodash.extend(messages, getFieldErrors(fieldErrors, fieldKey));
} else {
  // If a simple string, you have your error
  messages[fieldKey] = fieldErrors;
}

product.js

GitHub: aadarshp31/Ecommerce-MERN-stack

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}

//Fetching product from req.product which is populated using getProductById
let product = req.product;
//updating the product object with new data source as fields given by formidable
product = _.extend(product, fields);

//Handle files here
if (file.photo) {
	//file size only upto 3MB is allowed

contentful.js

GitHub: nsbarsukov/ml-bug-detector

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// {any:any}* -> {any:any}
merge: function(/* objs */){
  var dest = _.some(arguments) ? {} : null;

  if (truthy(dest)) {
    _.extend.apply(null, concat.call([dest], _.toArray(arguments)));
  }

  return dest;
},

+ 589 other calls in file

model.js

GitHub: maxprogram/grand-central-records

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    };
};

// There may be a better way to do this, but I don't know it...
function addToPrototype(obj, data) {
    obj.__proto__ = _.extend(_.clone(obj.__proto__), data);
}

function loadDefaults(schema, data) {
    schema = _(schema).reduce(function(defaults, val, key) {

+ 15 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(entries); // => [['a', 1], ['b', 2]]


const entriesIn = _.entriesIn({ 'a': 1, 'b': 2 });
console.log(entriesIn); // => [['a', 1], ['b', 2]]


const extend = _.extend({ 'a': 1 }, { 'b': 2 }, { 'c': 3 });
console.log(extend); // => { 'a': 1, 'b': 2, 'c': 3 }


const extendWith = _.extendWith({ 'a': 1 }, { 'b': 2 }, { 'c': 3 }, (a, b) => a + b);
console.log(extendWith); // => { 'a': 1, 'b': 2, 'c': 3 }

+ 15 other calls in file

Other functions in lodash

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lodash.get is the most popular function in lodash (7670 examples)

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