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Lodash _.concat() Function - GeeksforGeeks

Last Updated : 30 Aug, 2024

Lodash _.concat() function is used to concatenate the arrays in JavaScript. and it returns the new concatenated array.

_.concat(array, [values]);

• array: It is an array to which values are to be added.
• values: It is the Array of values that is to be added to the original array.

Note: The array value can also contain arrays of an array or simply a single object to be added to the original array.

• This function returns the array after concatenation.

Example 1: In this example, we are concatenating two arrays having numbers and string as a value by the use if the _concat() method.

// Requiring the lodash library
let lodash = require("lodash");

// Original array to be concatenated
let array = [1, 2, 3];

// Values to be added to original array 
let values = [0, 5, "a", "b"]

let newArray = lodash.concat(array, values);
console.log("Before concat: " + array);

// Printing newArray 
console.log("After concat: " + newArray);

Output:

Example 2: In this example, we are concatenating two arrays having numbers,strings and sub array as a value by the use if the _concat() method.

// Requiring the lodash library
let lodash = require("lodash");

// Original array to be concatenated
let array = ["a", 2, 3];

// Array of array to be added 
// to original array
let values = [0, 5, ["a", "b"]]
let newArray = lodash.concat(array, values);
console.log("Before concat: ", array);

// Printing array
console.log("After concat: ", newArray);

Output:

Example 3: In this example, we are concatenating two arrays having numbers, strings, and object as a value by the use if the _concat() method.

// Requiring the lodash library
let lodash = require("lodash");

// Original array to be concatenated
let array = ["a", 2, 3];

// Object of values to be 
// added to original array 
let values = { "a": 1, "b": 2 }
let newArray = lodash.concat(array, values);
console.log("Before concat: ", array);

// Printing array 
console.log("After concat: ", newArray);

Output:

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