Absolute function in javascript

How to find absolute value in JavaScript

Absolute value is a positive value or a value without negation. This guide will describe the detailed knowledge of the JavaScript Math.abs() method with the following outcomes. – How does JavaScript Math.abs() method works – How to use the JavaScript Math.abs() method How does JavaScript Math.abs() method works Math.abs() is a static function of JavaScript and returns the absolute value.

How to find absolute value in JavaScript

The JavaScript Maths.abs() method provides a utility to attain the absolute value of a number. The abs() method is an absolute function of maths and therefore, it is used as the Math.abs() method. Absolute value is a positive value or a value without negation.

Math.abs() method belongs to ECMAScript1 and is supported by all the browsers. This guide will describe the detailed knowledge of the JavaScript Math.abs() method with the following outcomes.

– How does JavaScript Math.abs() method works

– How to use the JavaScript Math.abs() method

How does JavaScript Math.abs() method works

Math.abs() is a static function of JavaScript and returns the absolute value. Let’s refer to the following syntax of the Math.abs() method.

Here, ‘n’ is a parameter and Math.abs() retrieves the absolute value of ‘n’ .

Math.abs() method returns the same output if the ‘ n ’ is positive or zero. However, if the given number is negative then it removes the negation and returns a positive number.

How to use the JavaScript Math.abs() method

Javascript Math.abs() function is commonly used to acquire the absolute value of a given number. It refers to its distance from the minimum value on the number line without any direction.

How to use the Math.abs() method with the positive number

Here, we’ll show you how Math.abs() method behaves when a positive number is passed to it.

In the above code, a positive value ‘ 37 ’ is passed to the Math.abs() method and the result of the Math.abs() method is stored in a variable.

The output showed that the function returned the same value as an output because the Math.abs() function returns the absolute values only. Therefore, the returned output number is ‘37’.

How to use the Math.abs() method with the negative number

This example demonstrates the working of the Math.abs() method if a negative number is passed to it.

In this code, the negative value ‘-18’ is passed as a parameter to the Math.abs() function.

The output showed that the function returned the positive value of the ‘18’ . We know that the Math.abs() function only returns the absolute values.With the negative values, this function removes the negation sign and converts them into positive values.

How to use the Math.abs() method with the null value

The following code is practised to understand the working of Math.abs() in presence of a null value.

In the above code, a null value is passed to the Math.abs() function.

The output showed that the Math.abs() function returned the ‘0’ when a null value is passed to a parameter. It is the property of Math.abs() method that the function returns the ‘0’ for an empty string.

Conclusion

In JavaScript, the Math.abs() function is used to obtain the absolute value of a number. Math.abs() changes the sign of negative number. However, it returns the same number in case of a positive number or zero value. This post demonstrates the working and usage of the Math.abs() method in JavaScript.

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How to get the absolute position of a vertex in three.js?

As far as I know var point = object.geometry.vertices[i]; will return with the relative position for the x , y and z of the point inside the geometry of the object.

How to get the absolute position, if the object was moved, rotated or scaled?

First make sure the object’s matrices have been updated.

The render loop usually calls this for you.

var vector = object.geometry.vertices[i].clone(); vector.applyMatrix4( object.matrixWorld ); 

The vector will now contain the position in world coordinates.

You might want to read some CG reference books.

1. 3d math primer for graphics and game development / by Fletcher Dunn and Ian Parberry
2. essential mathematics for Games and Interactive Applications: A Programmer’s Guide James M. Van Verth and Lars M. Bishop

Recent versions of Three.js (v50+) provide this functionality built into the THREE.Object3D class. In particular, to get the world coordinates of a local THREE.Vector3 instance named vector , use the localToWorld method:

object.localToWorld( vector ); 

Similarly, there is a worldToLocal method for converting world coordinates into local coordinates, which is slightly more complicated, mathematically speaking. To translate a world vector into the objects local coordinate space:

object.worldToLocal( vector ); 

Which is the fastest way to get the absolute value of a, There is a great trick to calculate the absolute value of a 2s-complement integer without using an if statement. The theory goes, if the value is negative you want to toggle the bits and add one, otherwise you want to pass the bits through as is. A XOR 1 happens to toggle A and A XOR 0 happens to leave A …

How to get function of both position values: Fixed and Absolute?

I have a fullscreen background image. I also have a pop-out sidebar.

When the sidebar pops out it re-sizes the background image smaller so as to not cut it off by covering over it. When the sidebar is retracted then the image enlarges back.

I can only get this effect if the background image has a position value of absolute. However that value also doesn’t let you scroll without the background ending and getting blank space or having to repeat the image to fill the blank space.

When I make the position value fixed then it solved the blank space issue, but no longer re-sizes the background image when you open the sidebar, it covers up part of the background as you’d expect.

How do I get the effects of both the position values of Fixed and Absolute? I want it to scroll indefinitely without having to duplicate the image, but also re-size when the sidebar is opened.

Here is the theme I’m using that illustrates my problem: http://themes.themolitor.com/wpzoom/2011/04/first-blog-post-title/

$(function() < $('#openSidebar').click(function() < if ( $('#sidebar').width() == 300 ) < var y = window.innerWidth; $("#imageContainer").width(y-300); >else < $('#sidebar').width(0); $('#imageContainer').width("100%"); >>); $('#closeSidebar').click(function() < if ( $('#sidebar').width() == 300 ) < var y = window.innerWidth; $("#imageContainer").width(y); >else < $('#sidebar').width(0); $('#imageContainer').width("100%"); >>); >); 

Actually thats easier. Obviously you will have a button that opens your sidebar when you click it. Considering your sidebar is on the right (like your example theme) you just need to resize bg’s width and leave height as it is. So this is the code:

document.getElementById("sidebar-button").addEventListener("click", doStuff, false); doStuff = function() < var sb = document.getElementById("sidebar"); var bgnd = document.getElementById("bg"); if ( sb.style.width == 0 ) < sb.style.width = "300px"; var y = window.innerWidth; bgnd.style.width = y - 300 + "px"; >else < sb.style.width = "0px"; bgnd.style.width = "100%"; >>; 

But you still need the the idea of window.onresize so you can adjust bg’s width correctly.

I just tested and works just fine, the only difference is that it use jQuery.

Lets say the background is a div with id #bg then all you have to do is to resize the bg when the window is resized using javascript considering when your window starts to be scrollable. If for example your windows starts to be X-scrollable when its width is 800px or less and Y-Scrollable when its height is 500px:

Get the absolute value of a number in Javascript, I want to get the absolute value of a number in JavaScript. That is, drop the sign. I know mathematically I can do this by squaring the number then taking the square root, but I also know that this is horribly inefficient. x = -25 x = x * x x = Math.sqrt (x) console.log (x) Code sampleMath.abs(‘-1’); // 1Math.abs(-2); // 2Math.abs(null); // 0Math.abs(«string»); // NaNMath.abs(); // NaNFeedback

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JavaScript Absolute Value — Math.abs()

In this short tutorial, we look at the JavaScript absolute value (math.abs()) method. We explain the syntax with a real-world example.

Table of Contents — Absolute Value Python:

TL;DR — How to find the absolute value in JavaScript?

The math.abs() function is used to return the absolute value in JavaScript. It negates the native sign of a number and returns the relevant positive value.

console.log(Math.abs(-2)); //Output = 2 

JavaScript Absolute Value:

JavaScript Absolute value is a method of the Math object in JavaScript. This method helps return the absolute values of a number. Absolute value or modules essentially means a non-negative value of x.

To understand the math involved let’s first understand what absolute value actually means. Absolute value is the distance between any number and 0 on the number line. Since it is the distance, there are no negative values.

Subsequently, when a 0 is passed, JavaScript returns 0 as the distance would also be 0.

How to use the Math.abs() function?

Using the Math.abs() method is quite straightforward. The only thing that you have to keep in mind is that abs() is a static method of Math. Hence you would have to add the Math. prefix in case you want to use it.

JavaScript Absolute Value — Syntax:

Parameters:

Return Values:

Code and Explanation:

The best way to familiarise yourself with the JavaScript Absolute method is to practice and try breaking it. In the below code we have used math.abs() methods on a list of values.

Math.abs(-10); // 10 Math.abs(10); // 10 Math.abs('-10'); // 10 Math.abs(''); // 0 Math.abs([]); // 0 Math.abs(null); // 0 Math.abs([2]); // 2 Math.abs([1,2]); // NaN Math.abs(<>); // NaN Math.abs('Ten'); // NaN Math.abs(); // NaN 

Another important point to remember while using the math.abs() methods, is it converts strings containing a number and returns its absolute value.

Closing Thoughts — JavaScript Absolute method:

This method is mostly used before displaying a particular value. A common example would be while displaying distance on a map. In cases where you cross your destination, you are not returned with a negative value but rather the absolute value from the destination.

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JavaScript Math.abs()

The Math.abs() method returns the absolute value of a number.

JavaScript Rounding Functions

Syntax

Parameters

Return Value

Type	Description
Number	The absolute value of the number.

Related Pages:

Browser Support

Math.abs() is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:

Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes

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Math.abs()

The Math.abs() static method returns the absolute value of a number.

Try it

Syntax

Parameters

Return value

The absolute value of x . If x is negative (including -0 ), returns -x . Otherwise, returns x . The result is therefore always a positive number or 0 .

Description

Because abs() is a static method of Math , you always use it as Math.abs() , rather than as a method of a Math object you created ( Math is not a constructor).

Examples

Using Math.abs()

.abs(-Infinity); // Infinity Math.abs(-1); // 1 Math.abs(-0); // 0 Math.abs(0); // 0 Math.abs(1); // 1 Math.abs(Infinity); // Infinity 

Coercion of parameter

Math.abs() coerces its parameter to a number. Non-coercible values will become NaN , making Math.abs() also return NaN .

.abs("-1"); // 1 Math.abs(-2); // 2 Math.abs(null); // 0 Math.abs(""); // 0 Math.abs([]); // 0 Math.abs([2]); // 2 Math.abs([1, 2]); // NaN Math.abs(>); // NaN Math.abs("string"); // NaN Math.abs(); // NaN 

Specifications

Browser compatibility

BCD tables only load in the browser

See also

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