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Lodash _.fill

Overview

The _.fill() method in lodash is a utility function that can be used to fill an array with a certain value. This method takes three parameters:

  1. array: The array to fill.
  2. value: The value to fill the array with.
  3. start (optional): The index to start filling the array from. If this value is not provided, the array will be filled starting at index 0.

Here is an example of using the _.fill() method to fill an array with the value 'apple' from index 1 to 3:

const arr = ['banana', 'orange', 'grape', 'kiwi'];
_.fill(arr, 'apple', 1, 3);

console.log(arr);
// Output: ['banana', 'apple', 'apple', 'kiwi']

In this example, the _.fill() method is called with the arr array as the first parameter, 'apple' as the second parameter, and 1 and 3 as the third and fourth parameters, respectively. This causes the arr array to be filled with 'apple' from index 1 to 3, resulting in the output ['banana', 'apple', 'apple', 'kiwi'].

If the start parameter is not provided, the _.fill() method will fill the entire array with the specified value:

const arr = ['banana', 'orange', 'grape', 'kiwi'];
_.fill(arr, 'apple');

console.log(arr);
// Output: ['apple', 'apple', 'apple', 'apple']

In this example, the _.fill() method is called with the arr array as the first parameter and 'apple' as the second parameter. Since the start parameter is not provided, _.fill() fills the entire arr array with 'apple', resulting in the output ['apple', 'apple', 'apple', 'apple'].

The _.fill() method is useful when you need to initialize an array with a certain value, or when you need to reset a portion of an array to a certain value. It can be used in a wide variety of scenarios, such as filling an array with zeroes or resetting a portion of an array to a default value.