JavaScript Numeric Data Type

Manipulate Numbers In JavaScript

In JavaScript, assigning of a value will indicate the data type. Get the data type of any object using the built-in typeof function.

JavaScript has built-in functions for manipulating numbers. Some examples are integers and floats of a specified value.

The integer and float numeric data types ar stored as double precision floating numbers. Numeric data types can be positive or negative. Scientific numbers with the letter “e” can be used to indicate the power of 10.

JavaScript Numeric Functions

Numeric Methods

Sample Methods

Name	Description	Example
toString()	Returns number as a string.	str1 = num1.toString();
toExponential()	Returns number in exponential notation.	num2 = num1.toExponential(2);
toFixed()	Returns number with fixed decimals.	num2 = num1.toFixed(2);
toPrecision()	Returns number of specific length.	num2 = num1.toPrecision(2);
valueOf()	Returns number as number.	num2 = num1.valueOf();
Number()	Returns converted number.	num2 = Number(“10”);
parseInt()	Returns whole number.	num2 = parseInt(“10”);
parseFloat()	Returns floating number.	num2 = parseFloat(“10”);
Name	Description	Example

JavaScript Manipulate Numbers Snippet

// OjamboShop.com Learning JavaScript Numeric Data Type Tutorial //
// Data Type
my_int = 10;
my_float = 11.11;
alert(my_int) // Dialog Prints 10
alert(typeof(my_int)) // Dialog Prints number
console.log(my_float); // Console Prints 11.11
console.log(typeof(my_float)); // Console Prints number

// Casting Integers
let int1 = Number("5"); // Will be 5
let int2 = parseInt("3.0"); // Will be 3
let int3 = Number("9"); // Will be 9
console.log(int1, int2, int3); // Console Prints 5 3 9

Casting Floats
let float1 = Number("5.0"); // Will be 5.0
let float2 = parseFloat("3.0"); // Will be 3.0
let float3 = Number("9.0"); // Will be 9.0
console.log(float1, float2, float3); // Console Prints 5.0 3.0 9.0

// Integer Numbers
let int1 = 5;
let int2 = 3;
let int3 = -9;
console.log(int1, int2, int3); // Console Prints 5 3 -9

// Float Numbers
let float1 = 5.0;
let float2 = 3.0;
let float3 = -9.0;
let float4 = -27.1e10;
console.log(float1, float2, float3, float4); // Console Prints 5.0 3.0 -9.0 -271000000000

// Manipulating Numbers
console.log(parseInt("10"));
console.log(parseFloat("10"));
console.log(parseFloat("10").toFixed(2));

Usage

You can use any IDE or text editor and the web browser to compile and execute JavaScript code. For this tutorial, the OjamboShop.com Learning JavaScript Course Web IDE can used to input and compile JavaScript code for the numeric data type.

Open Source

JavaScript follows the ECMAScript standard and is licensed under the W3C Software License by web browser vendors and runtime environment vendors. This allows commercial use, modification, distribution, and allows making derivatives proprietary.

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Conclusion:

JavaScript makes it easy to use the numeric data type. Use integers or floats and the built-in methods to manipulate numbers.

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