TypeScript Number toExponential()

In this chapter, we will explore the toExponential() method for numbers in TypeScript. This method converts a number to a string in exponential notation. Understanding how to use toExponential() is useful for formatting numbers in scientific notation.

Table of Contents

1. Definition
2. Syntax
3. Examples
4. Conclusion

1. Definition

The toExponential() method converts a number to a string in exponential notation. This is particularly useful for representing very large or very small numbers in a more compact form.

2. Syntax

number.toExponential(fractionDigits?);

Parameters

• fractionDigits (optional): An integer specifying the number of digits after the decimal point. It must be in the range of 0 to 20, inclusive. If omitted, the number of digits after the decimal point is as many as necessary to represent the value.

Return Value

The method returns a string representing the number in exponential notation.

3. Examples

Let's look at some examples to understand how toExponential() works in TypeScript.

Example 1: Basic Usage

In this example, we use toExponential() to convert a number to exponential notation.

let num: number = 123456;
let result = num.toExponential();
console.log(result); // Output: "1.23456e+5"

Example 2: Specifying Fraction Digits

In this example, we use toExponential() to convert a number to exponential notation with a specified number of digits after the decimal point.

let num: number = 123456;
let result = num.toExponential(2);
console.log(result); // Output: "1.23e+5"

Example 3: Using toExponential() with Small Numbers

In this example, we use toExponential() to convert a small number to exponential notation.

let num: number = 0.000123;
let result = num.toExponential();
console.log(result); // Output: "1.23e-4"

Example 4: Using toExponential() with Negative Numbers

In this example, we use toExponential() to convert a negative number to exponential notation.

let num: number = -123456;
let result = num.toExponential(3);
console.log(result); // Output: "-1.235e+5"

Example 5: Using toExponential() without Fraction Digits

In this example, we use toExponential() without specifying fraction digits.

let num: number = 987654321;
let result = num.toExponential();
console.log(result); // Output: "9.87654321e+8"

4. Conclusion

In this chapter, we explored the toExponential() method for numbers in TypeScript, which is used to convert a number to a string in exponential notation. We covered its definition, syntax, parameters, return value, and provided several examples to demonstrate its usage. Understanding how to use toExponential() effectively can help in various tasks where scientific notation is required, especially when dealing with very large or very small numbers.