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Lodash _.fill() Method - GeeksforGeeks

Last Updated : 30 Aug, 2024

Lodash _.fill() method is used to fill a set of values into the array in a given range.

_.fill(array, value, startIndex, endIndex);

• Array: It is the original array that is to be filled with certain values.
• Value: Value to be filled in the array.
• startIndex: It is the index from where the value is to be filled.
• endIndex: It is the index to which values are to be filled in the array.

Note:

• All indexes less than endIndex are included except endIndex.
• Changes are done in the original array.

• It returns the array.

Example 1: In this example, we are replacing the first four elements of the given array by 10 by the use of the lodash _.fill() method.

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

// Original array
let array = [2, 2, 3, 4, 5, 6]

// Printing original array 
console.log("Before : ", array)

// Using fill() method to replace
// values in range (0, 4]
_.fill(array, 10, 0, 4)

// Printing original array again 
console.log("After : ", array)

Output:

Example 2: In this example, we are replacing the first ten elements of the given array by 10 by the use of the lodash _.fill() method. and endIndex is greater than the size of array.

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

// Original array
let array = [{ "aa": 1 },
{ "bb": 1 }, "a", "b"]

// Printing original array 
console.log("Before : ", array)

// Using fill() method to replace
// values in range (0, 10] greater
// then size of array
lodash.fill(array, 10, 0, 10)

// Printing original array again 
console.log("After : ", array)

Output:

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