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Lodash _.forIn



The _.forIn method is a utility function provided by the Lodash JavaScript library. It is a convenient way to iterate over properties of an object and execute a callback function for each property.


The _.forIn method is used in the following way:

_.forIn(object, [iteratee=_.identity])


  • object (Object): The object to iterate over.
  • [iteratee=_.identity] (Function): The function called per iteration. If it returns false, iteration is stopped.

The callback function takes two arguments:

  • (value, key): The current property's value and key.


Consider the following object:

const myObj = {
    foo: 'hello',
    bar: 'world',
    baz: 42

We can use _.forIn method to iterate over all the properties of this object and log their values like this:

_.forIn(myObj, (value, key) => {
    console.log(`${key}: ${value}`);


foo: hello
bar: world
baz: 42


  • _.forIn method makes it easier to iterate over all the properties of an object.
  • It reduces code verbosity and repetition.
  • It helps in quick data processing by allowing easy callback functions.

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