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Lodash _.toNumber


The lodash _.toNumber method is a utility function that converts a given value to a number. This method is useful when dealing with strings that represent numbers or other values that might need to be coerced to numeric values.

The _.toNumber method supports the following types of input:

  1. Strings containing valid number representations, including scientific notation (1e+2) and hexadecimal (0xFF)
  2. Number objects, which are parsed and returned as primitive numbers
  3. Booleans, which are coerced to either 0 or 1
  4. Dates, which are converted to their numeric representation (getTime())
  5. Arrays, which are recursively converted using and _.toNumber
  6. Objects, which are recursively converted using _.mapValues and _.toNumber

The _.toNumber method can also handle malformed input by returning the value NaN when conversion is not possible.

This method can be useful in a variety of contexts, such as parsing data from user input or external resources like APIs.

Here is an example of using the _.toNumber method to convert a string to a number:

const stringNum = '42';
const number = _.toNumber(stringNum); // 42

In this example, the stringNum variable is a string containing the number 42. The _.toNumber method is called with this string as an argument, and returns the numeric value 42.

By using _.toNumber, you can ensure that your code always deals with numeric values when it needs to, preventing common issues like type errors and incorrect calculations.