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Lodash _.round

Overview

The _.round() method from the popular JavaScript utility library Lodash is a versatile function for rounding numbers. This method can be used to round any number to a specified number of decimal places or to the nearest whole number.

To use _.round(), simply pass the number you want to round as the first argument and the number of decimal places to round to as the second argument. For example, to round the number 3.14159 to two decimal places, you would call _.round(3.14159, 2). The result of this function call would be 3.14.

If you omit the second argument, _.round() will round to the nearest whole number. For example, _.round(3.6) would return 4, while _.round(3.3) would return 3.

One of the great features of _.round() is that it can handle negative numbers and decimal places specified as negative numbers. For example, _.round(-3.14159, -2) would round the number to the nearest hundred, resulting in -3100.

It's important to note that _.round() uses banker's rounding. This means that if the number being rounded ends in a 5 and the number before the 5 is an even number, the result will be rounded down. For example, _.round(2.5) would return 2, while _.round(3.5) would return 4.

In addition to rounding numbers, _.round() can also be used to round arrays of numbers. If you pass an array as the first argument, _.round() will return a new array with each number rounded to the specified number of decimal places. For example, _.round([3.14159, 2.71828], 2) would return [3.14, 2.72].

Overall, the _.round() method is a versatile, easy-to-use function for rounding numbers and arrays of numbers. It's a useful tool for any developer working with JavaScript and requires no additional dependencies beyond the Lodash library.