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JavaScript Math Object

The Math Object

Unlike other objects, the Math object does not consist of a constructor

The Math object is static.

All methods and properties are used without creating a math object first.

Math Properties (Constants)

The syntax to use any Math property is: Math. property

JavaScript provides 8 mathematical constants that can be used as Math properties:

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math Constants</h2>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML =

“<p><b>Math.E:</b> ” + Math.E + “</p>” +

“<p><b>Math.PI:</b> ” + Math.PI + “</p>” +

“<p><b>Math.SQRT2:</b> ” + Math.SQRT2 + “</p>” +

“<p><b>Math.SQRT1_2:</b> ” + Math.SQRT1_2 + “</p>” +

“<p><b>Math.LN2:</b> ” + Math.LN2 + “</p>” +

“<p><b>Math.LN10:</b> ” + Math.LN10 + “</p>” +

“<p><b>Math.LOG2E:</b> ” + Math.LOG2E + “</p>” +

“<p><b>Math.Log10E:</b> ” + Math.LOG10E + “</p>”;

</script>

</body>

</html>

Output

JavaScript Math Constants

Math.round()

Math.round(x) is used to return the nearest integer:

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.round()</h2>

<p>Math.round(x) returns the value of x rounded to its nearest integer:</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.round(4.6);

</script>

</body>

</html>

Output

JavaScript Math.round()

Math.round(x) returns the value of x rounded to its nearest integer:

Math.ceil()

Math.ceil(x) is used to return the value of x rounded up to its nearest integer:

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.ceil()</h2>

<p>Math.ceil() rounds a number <strong>up</strong> to its nearest integer:</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.ceil(4.4);

</script>

</body>

</html>

Output

JavaScript Math.ceil()

Math.ceil() rounds a number up to its nearest integer:

Math.floor()

Math.floor(x) is used to return the value of x rounded down to its nearest integer:

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.floor()</h2>

<p>Math.floor(x) returns the value of x rounded <strong>down</strong> to its nearest integer:</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.floor(4.7);

</script>

</body>

</html>

Output

JavaScript Math.floor()

Math.floor(x) returns the value of x rounded down to its nearest integer:

Math.trunc()

Math.trunc(x) is used to return the integer part of x:

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.trunc()</h2>

<p>Math.trunc(x) returns the integer part of x:</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.trunc(4.7);

</script>

</body>

</html>

Output

JavaScript Math.trunc()

Math.trunc(x) returns the integer part of x:

Math.sign()

Math.sign(x) is used to return the value, if x is negative, null or positive:

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.sign()</h2>

<p>Math.sign(x) returns if x is negative, null or positive:</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.sign(4);

</script>

</body>

</html>

Output

JavaScript Math.sign()

Math.sign(x) returns if x is negative, null or positive:

Math.pow()

Math.pow(x, y) is used to return the value of x to the power of y:

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.pow()</h2>

<p>Math.pow(x,y) returns the value of x to the power of y:</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.pow(8,2);

</script>

</body>

</html>

Output

JavaScript Math.pow()

Math.pow(x,y) returns the value of x to the power of y:

Math.sqrt()

Math.sqrt(x) is use to return the square root of x:

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.sqrt()</h2>

<p>Math.sqrt(x) returns the square root of x:</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.sqrt(64);

</script>

</body>

</html>

Output

JavaScript Math.sqrt()

Math.sqrt(x) returns the square root of x:

Math.abs()

Math.abs(x) returns the absolute (positive) value of x:

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.abs()</h2>

<p>Math.abs(x) returns the absolute (positive) value of x:</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.abs(-4.7);

</script>

</body>

</html>

Output

JavaScript Math.abs()

Math.abs(x) returns the absolute (positive) value of x:

Math.sin()

Math.sin(x) returns the sine (a value between -1 and 1) of the angle x (given in radians).

To use degrees instead of radians, degrees needs to be converted into radians:

Angle in radians = Angle in degrees x PI / 180.

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.sin()</h2>

<p>Math.sin(x) returns the sin of x (given in radians):</p>

<p>Angle in radians = (angle in degrees) * PI / 180.</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML =

“The sine value of 90 degrees is ” + Math.sin(90 * Math.PI / 180);

</script>

</body>

</html>

Output

JavaScript Math.sin()

Math.sin(x) returns the sin of x (given in radians):

Angle in radians = (angle in degrees) * PI / 180.

Math.cos()

Math.cos(x) returns the cosine (a value between -1 and 1) of the angle x (given in radians).

To use degrees instead of radians, convert degrees to radians:

Angle in radians = Angle in degrees x PI / 180.

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.cos()</h2>

<p>Math.cos(x) returns the cosine of x (given in radians):</p>

<p>Angle in radians = (angle in degrees) * PI / 180.</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML =

“The cosine value of 0 degrees is ” + Math.cos(0 * Math.PI / 180);

</script>

</body>

</html>

Output

JavaScript Math.cos()

Math.cos(x) returns the cosine of x (given in radians):

Angle in radians = (angle in degrees) * PI / 180.

Math.min() and Math.max()

Math.min() and Math.max() finds the lowest or highest value in a list of arguments:

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.min()</h2>

<p>Math.min() returns the lowest value in a list of arguments:</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML =

Math.min(0, 150, 30, 20, -8, -200);

</script>

</body>

</html>

Output

JavaScript Math.min()

Math.min() returns the lowest value in a list of arguments:

Math.random()

Math.random() returns a random number between 0 (inclusive), and 1 (exclusive):

Example

<!DOCTYPE html>

<html>

<body

<h2>JavaScript Math.random()</h2>

<p>Math.random() returns a random number between 0 and 1:</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.random();

</script>

</body>

</html>

Output

JavaScript Math.random()

Math.random() returns a random number between 0 and 1:

The Math.log2() Method

Math.log2(x) returns the base 2 logarithm of x.

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.log2()</h2>

<p>Math.log2() returns the base 2 logarithm of a number.</p>

<p>How many times must we multiply 2 to get 8?</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.log2(8);

</script>

</body>

</html>

Output

JavaScript Math.log2()

Math.log2() returns the base 2 logarithm of a number.

How many times must we multiply 2 to get 8?

The Math.log10() Method

Math.log10(x) returns the base 10 logarithm of x.

Example

<!DOCTYPE html>

<html>

<body>

<h2>JavaScript Math.log10()</h2>

<p>Math.log10() returns the base 10 logarithm of a number.</p>

<p>How many times must we multiply 10 to get 1000?</p>

<p id=”demo”></p>

<script>

document.getElementById(“demo”).innerHTML = Math.log10(1000);

</script>

</body>

</html>

Output

JavaScript Math.log10()

Math.log10() returns the base 10 logarithm of a number.

How many times must we multiply 10 to get 1000?


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