In this article, we discussed various techniques to convert a number to a string in JavaScript. You can now check t another tutorial if you are curious about how to convert string to number. One can choose the method that best suits the needs according to these factors. Decimal Precision: If you need to control the number of decimal places, the toFixed() method is a suitable choice.Readability: String interpolation and concatenation with an empty string are highly readable and make the code more expressive.Performance: Concatenation with an empty string and template strings tend to be faster and hence show better performance.We have to consider the specific requirements of a project while choosing a method for conversion. Note that toFixed() returns a string representation of the number, not a rounded number value. We rounded down the floating point number to 2 decimal places by passing 2 as a parameter in the toFixed() function and finally stored the string obtained from the function in a variable. We have used the toFixed() method to convert a floating point number to a string. Num: variable representing the number that has to be converted to stringĭecimal_places: a number that represents the decimal places by which the floating point number has to be rounded. Syntax of toFixed() Function is as follows: let convertedStr = num.toFixed(decimal_places)ĬonvertedStr: variable to store the string that we get from the toFixed() function. This method rounds the number to the specified precision and returns it as a string. But, this method is primarily used when you need to convert a number to a string with a specific number of decimal places. The toFixed() method is another method of converting a number to a string. The method works with both integers and floating-point numbers. printing and checking type of convertedStr variableĬonsole.log(convertedStr + " " + typeof(convertedStr)) printing and checking the type of numFloat variableĬonsole.log(numFloat + " " + typeof(numFloat)) Let us understand with the help of an example. The String() parameter would simply convert the number to a string in whichever form it is passed. The difference between the toString() function and the String() constructor is that the toString() method can convert the number into different decimal forms and then to a string, i.e. It takes any value or variable as the parameter and converts it into a string. String() is a constructor of the class String. We passed various radices and stored the obtained strings in different variables which are printed on the console. In this example, we have used the toString() function to convert the number 9 to a string. printing and checking type of convertedStr variablesĬonsole.log(convertedStrBin + " " + typeof(convertedStrBin)) Ĭonsole.log(convertedStrOct + " " + typeof(convertedStrOct)) Ĭonsole.log(convertedStrDec + " " + typeof(convertedStrDec)) Ĭonsole.log(convertedStrHex + " " + typeof(convertedStrHex)) using the toString() method with different radices Here is an example of listening to a keydown event on an element whose id is, 'type-here': let elem = document.getElementById('type-here') Įlem.//printing and checking the type of num variable You can add each of these event types to an HTML element or document object using the addEventListener method. We can get contextual information about these events from the KeyboardEvent interface's properties and methods. There are primarily three keyboard event types, keydown, keypress and, keyup. It extends the UIEvent interface which eventually extends the Event interface. The KeyboardEvent interface provides information using the defined constants, properties, and a single method (as of January 2021). The KeyboardEvent interface and the event types Finally, the current list of key codes for reference and future use.A playground to try things out as we learn.Which properties you need in practice and how different browsers handle them.The keyboard event types we may not ever need.The keyboard event types we need to focus on.At the same time, W3.org keeps updating the specification by introducing new properties, deprecating existing ones, and marking certain code as legacy.īecause of this, it is essential for web developers to keep learning about the KeyboardEvent interface to know what exactly they should use and what's no longer relevant. There have been many articles written about how they work and how to use them. Like many other JavaScript events, the KeyboardEvent interface provides all the required properties and methods for handling every keystroke a user makes using the keyboard. JavaScript keyboard events help you capture user interactions with the keyboard.
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