How to use the identity function from lodash

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

lodash.identity is a function that returns the first argument passed to it.

astrobench.js

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 * @param {*} value Any value.
 * @returns {*} Returns `value`.
 * @example
 *
 * var object = { 'name': 'fred' };
 * _.identity(object) === object;
 * // => true
 */
function identity(value) {
  return value;

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lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.has                 = _.has;
module.exports.hasIn               = _.hasIn;
module.exports.hasPath             = _.hasPath;
module.exports.head                = _.head;
module.exports.humanize            = _.humanize;
module.exports.identity            = _.identity;
module.exports.implode             = _.implode;
module.exports.inRange             = _.inRange;
module.exports.inc                 = _.inc;
module.exports.includes            = _.includes;

122

+ 92 other calls in file

How does lodash.identity work?

lodash.identity is a function in the Lodash library that returns the first argument it receives. If you pass more than one argument, it returns the first one and discards the rest. It is often used as a default value or placeholder for a function argument when you need to pass a function but don't want to do anything with the argument.

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(flow(1)); // => 4


const flowRight = _.flowRight([function(n) { return n * 3; }, function(n) { return n + 1; }]);
console.log(flowRight(1)); // => 4


const identity = _.identity(1);
console.log(identity); // => 1


const iteratee = _.iteratee({ 'a': 1 });
console.log(iteratee); // => [Function: matches]

+ 15 other calls in file

generic_service.js

GitHub: aiming/grpc

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  requestStream: false,
  responseStream: false,
  requestSerialize: _.identity,
  requestDeserialize: _.identity,
  responseSerialize: _.identity,
  responseDeserialize: _.identity
},
'streamingCall' : {
  path: '/grpc.testing.BenchmarkService/StreamingCall',
  requestStream: true,

+ 19 other calls in file

Ai Example

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const value = 42;
const identityValue = _.identity(value); // identityValue === value

In this example, value is a variable containing the value 42. _.identity is used to create a new function that simply returns its first argument. This function is then called with value as its argument, and the return value is assigned to identityValue. Since _.identity simply returns its first argument, identityValue will have the same value as value, which is 42.

helper.js

GitHub: SumeetOutlook/sumeet-practice

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const replaceWinPath = (path) => {
  return _.isString(path) ? path.replace(/\\/g, '/') : path
}


exports.normalizeWinPath = process.platform === 'win32' ? replaceWinPath : _.identity


exports.mkdirIfNotExists = (directory, done) => {
  // TODO(vojta): handle if it's a file
  /* eslint-disable handle-callback-err */

+ 3 other calls in file

convert_to_excel.js

GitHub: OneDev0411/Node-Backend

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this.rules.forEach(r => {
  if (!headersAdded) {
    this.headers.push(r.headerName)
  }
  // To prevent calling an undefined value
  const format = r.format || _.identity
  if (!_.isNil(r.rowName) && _.isFunction(r.rowName)) {
    cells.push(format(r.rowName(c) || ''))
  } else {
    cells.push(format(c[r.rowName] || ''))

+ 2 other calls in file

reader.js

GitHub: KMCControls/influxdb-nodejs

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    break;
  case 'csv':
    fn = util.toCsv;
    break;
  default:
    fn = _.identity;
    break;
}
try {
  const result = fn(data);

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