string method to convert string to number javascript

If the radix is not included, then it is 10 (decimal value) by default. The radix specifies the mathematical number system you want to use and the base of the number that will be returned – whether the number will be a base 2 (or binary), base 8 (or octal), base 10 (decimal), or base 16 (or hexadecimal) number. The string is the value that needs to be converted into a number. The parseInt() function takes two arguments: a string as the first argument and a radix as the second optional argument. The general syntax for the parseInt() function is the following: parseInt(string, radix) How to Convert a String into a Number Using the parseInt() Function You can check that for yourself by doing the following: let num = '7' To avoid any mistakes and double-check the data type of a value in JavaScript, use the typeof operator.Įarlier I mentioned that numbers enclosed in quotation marks are strings. How to Check the Data Type of a Value in JavaScript? Something to be aware of is that numbers shouldn't be surrounded by quotes - that will automatically make them a string. Let num = 477e-2 // equal to dividing 477 to 10 to the power of 2 (or 100) which results in 4.77 exponential - to represent small numbers Let num = 477e2 // equal to multiplying 477 to 10 to the power of 2 (or 100) which results in 47700 exponential - to represent large numbers The letters A - F are associated with the values 10 -15. After that, there can be a combination of hexadecimal digits ranging from 0 - 9 and letters ranging from A - F (or a - f). A hexadecimal number begins with a 0 followed by either an x or X.

Hexadecimal numbers (also known as base 16 numbers).

An octal number begins with a 0 followed by octal digits which range from 0 - 7.

Octal numbers (also known as base 8 numbers).

The number begins with a 0 followed by a b followed by an 8-bit number. Binary is a numerical system comprised of only two numbers: 0 and 1.

Binary numbers (also known as base 2 numbers).

The e indicates multiplying a number by 10 raised to a given power.

Exponential numbers are numbers that can be integers or floats and are followed by an e.

A float is a number with a decimal and at least one number following the decimal point. An integer is a numerical value that does not include a decimal part - also known as a round or whole number. In JavaScript, there are several different types of numbers (both positive and negative) built into the language: For example, you do not need to mention whether the number will be an integer or a float. Unlike other programming languages, you do not need to specify the type of number you want to create. Numbers in JavaScript are a primitive data type – just like strings. Numbers let you represent numerical values and perform mathematical operations and calculations. The last way of creating strings in JavaScript is also known as a template literal. Here is how to create a string using double quotes: // string created using double quotes ('')Īnd here is how to create a string using backticks: // string created using backticks (``) Here is how to create a string using single quotes: // string created using single quotes ('')

Specifically, there are three ways you can create a string in JavaScript:

Generally, you can tell if a data value is a string if it is enclosed in quotes, such as single or double quotes.

Specifically, it is a sequence of one or more characters that can be either letters, numbers, or symbols (such as punctuation marks). This means that they are built into the language by default.Ī string is an ordered sequence of zero or more character values. Strings in JavaScript are a primitive data type. They are one of the most fundamental data types in all programming languages. Strings are an effective way of communicating through text, such as storing and manipulating text.

How to convert a string into a number by using the Unary + operator.

How to convert a string into a number by multiplying and diving by 1.

How to convert a string into a number using Math functions.

How to convert a string into a number using the Number() function.

How to convert a string into a number using the parseFloat() function.

How to convert a string into a number using the parseInt() function.

How to check the data type of a value in JavaScript?.

In this article, you will learn some of the built-in JavaScript methods available for converting strings to numbers, along with an introduction (or refresher!) to the basics of how strings and numbers work in JavaScript. JavaScript has different built-in methods to convert or cast a string into a number. The ability to convert one data type to another gives you great flexibility when working with information. For example, you may need to convert a string into a number.

When you're programming, you'll often need to switch between data types.

String method to convert string to number javascript