Importance of Converting Strings to Numbers
The most common reason is that you need to perform mathematical operations on that value. For example, if you have a string like “5”, you can’t just add 1 to it and expect the result to be 6. You need first to convert it to a number, perform the calculation, and then convert it back to a string if necessary.
Another reason why you might need to convert a string is that you’re reading in values from an external source, like user input or from a file. The values will always be strings in these cases, so you’ll need to convert them before using them in your program.
The main difference between these two methods is that parseInt() only returns whole numbers while parseFloat() can return fractional numbers as well.
Let’s take a look at an example:
parseInt(“5”); // Returns 5
parseFloat(“5”); // Also returns 5
parseInt(“5.5”); // Returns 5
parseFloat(“5.5”); // Returns 5.5
As you can see from the above code, both parseInt() and parseFloat() can be used to convert strings containing whole numbers with no decimal point. However, only parseFloat() can be used for strings containing fractional numbers. If you try to use parseInt() for these kinds of strings, it will simply stop parsing at the decimal point and return the whole number before it.
Practical usage scenario
In this post, we looked at how these methods work and some practical usage scenarios for them. Finally, we gave some tips on what factors you should keep in mind when converting strings into numbers. Thanks for reading!