Is the Number 1 Text?

In today’s post, you can sort of think of this as a related post towards the last one. I have alluded to how numbers can actually be a data type of text depending on how they enter your program or are created. We need some ways to deal with these scenarios. JavaScript gives us some.

number()

The number function/method allows us to take a number that is text and convert is to an integer. If text is passed to the function, it will return NaN. It will also convert boolean to 1 or 0.

[code lang=”js”]
// Create a text number variable
var myNum = "10";
myNum = number(myNum);
var myNum = true;
myNum = number(myNum);
// Code would return 1
var myNum = "123abc";
myNum = number(myNum);
// Code would return NaN
[/code]

 parseFloat()

The parseFloat function/method returns a floating point number. It looks at the data, determines if the first character is a number, then it parses the string until it reaches a non-number. This could be a space or text. If the first character is text, it returns NaN.

[code lang=”js”]
// Create a text variable
var myNum = "10";
myNum = parseFloat(myNum);
// Code would return the integer 10
myNum = "10.123";
myNum = parseFloat(myNum);
// Code would return the integer 10.123
myNum = "10 abc";
myNum = parseFloat(myNum);
// Code would return the integer 10
myNum = "abc 10";
myNum = parseFloat(myNum);
// Code would return NaN
[/code]

 parseInt()

The parseInt function will parse through a string and return a number just like parseFloat, except it will not return floating numbers. All other rules apply though.

[code lang=”js”]
// Create a text variable
var myNum = "10";
myNum = parseInt (myNum);
// Code would return the integer 10
myNum = "10.123";
myNum = parseInt (myNum);
// Code would return the integer 10
myNum = "10 abc";
myNum = parseInt (myNum);
// Code would return the integer 10
myNum = "abc 10";
myNum = parseInt (myNum);
// Code would return NaN
[/code]

Happy Coding!

Clay Hess

More To Explore

Digital interface displaying code aligned with golden ratio in a dark futuristic room with glowing screens at a tech hub
Code

Unleashing Creativity with the Canvas API

The Canvas API stands as one of the web’s most powerful tools for creating dynamic, interactive graphics. Unlike SVG, Canvas operates at the pixel level, making it ideal for games, data visualizations, and real-time graphics processing. With a simple HTML element and JavaScript, developers can create everything from basic shapes to complex animations that push the boundaries of what’s possible in the browser.

Developer working with styles at a coffeehouse with code swirling around him
Code

The CSS Object Model (CSSOM): A Practical Guide

If you’ve ever used JavaScript to read or modify styles in the browser, you’ve touched the CSS Object Model—often without realizing it. The CSSOM sits

Share This Post

small_c_popup.png

Need help?

Let's have a chat...


Login

Jump Back In!

Here at Webolution Designs, we love to learn. This includes sharing things we have learned with you. 

Register

Begin Your Learning Journey Today!

Come back inside to continue your learning journey.