Yogesh Chauhan's Blog

What is the difference between let and var in Swift?

in Swift on February 28, 2020

let = Constant and var = variables. Period. As simple as that. Values of constants can not be changed but values of variables can be changed.

Constants and Variables

Constants and variables associate a name with a value of a particular type (such as the number 10 or the string "Hello"). The value of a constant can’t be changed once it’s set, whereas a variable can be set to a different value in the future.

Declaring Constants and Variables

Constants and variables must be declared before they’re used. You declare constants with the let keyword and variables with the var keyword. Here’s an example of how constants and variables can be used to track the number of login attempts a user has made:


let maximumNumberOfLoginAttempts = 10
var currentLoginAttempt = 0

In the example above, value of maximumNumberOfLoginAttempts can not be changed but value of currentLoginAttempt can and will be changed as user tries to log in each time.


Most Read

#1 How to add Read More Read Less Button using JavaScript? #2 How to check if radio button is checked or not using JavaScript? #3 Solution to the error “Visual Studio Code can’t be opened because Apple cannot check it for malicious software” #4 Solution to “TypeError: ‘x’ is not iterable” in Angular 9 #5 How to uninstall Cocoapods from the Mac OS? #6 PHP Login System using PDO Part 1: Create User Registration Page

Recently Posted

#Apr 8 JSON.stringify() in JavaScript #Apr 7 Middleware in NextJS #Jan 17 4 advanced ways to search Colleague #Jan 16 Colleague UI Basics: The Search Area #Jan 16 Colleague UI Basics: The Context Area #Jan 16 Colleague UI Basics: Accessing the user interface
You might also like these
Use inline if to make a shorter conditional syntax in ReactReactIs there a CSS parent selector?CSSHow can one check to see if a remote file exists using PHP?PHPMicroservices vs Monolithic ArchitectureMiscellaneousHow to create a simple slider with CSS and jQuery?CSSA Step by Step Guide to Make RSS in XML For Any Website or Blog For FreeMiscellaneousSlider animation using CSS transform propertyCSSThe fundamental difference between HAVING and WHERE clauses in PostgresPostgresHow to create a sticky menu pin using CSS?CSSperspective property in CSSCSSSorting Arrays in JavaScriptJavaScriptWill SQL (Relational) Database become obsolete?SQL/MySQL