Lodash Seq Methods

About This Index

This page is the Lodash Seq index for the tutorial track. Each row links to a full guide with syntax, examples, and FAQs.

Seq is Lodash method chaining. Start with _.chain() or _(value), call collection/array/object helpers, then unwrap with .value().

How to Chain Lodash Methods

Wrap with _.chain(), keep calling methods, then unwrap with .value():

import _ from "lodash";

const users = [
  { user: "barney", age: 36 },
  { user: "fred", age: 40 },
  { user: "pebbles", age: 1 }
];

const youngest = _.chain(users)
  .sortBy("age")
  .map(function (o) {
    return o.user + " is " + o.age;
  })
  .head()
  .value();
// "pebbles is 1"

// Side effect vs transform
_.chain([1, 2, 3])
  .tap(function (array) { array.pop(); })
  .reverse()
  .value();
// [2, 1]

Lodash Seq Methods Table

All seq method guides in this Lodash tutorial series (12 tutorials).