I was working on a project recently that required unique API keys to be generated for clients connecting to the server. For various reasons, I settled on the style of license key you commonly see for software packages. You know, the kind you always had to read off the back of a CD case and type in when installing the application. Like
H8OV7-HNTB5-JLLOH-W8FG2 .
Aug 26, 2016 Top 10 Interview Questions for Front-end, Web, ui, JavaScript Developers Implement the bind function in javascript Fix a function that assigns event handler functions to an array of nodes the wrong way. Apr 28, 2019 If you change the entity or property name of a string, and the string has an accompanying access key, command key, or tooltip, you should update their names as well for consistency. This change is fundamental for access keys, since many localization tools use the entity name to connect an access key. In static languages like Java/C#, I commonly make use of constants for strings or numbers, rather than insert them into the code alone. However, I tend to avoid this practice in JavaScript. More recently, as some other coders around me have taken this approach in JS, I decided I should probably solidify either my, or their, reasoning.
It’s fairly easy to write such a function. The basic idea is to loop around four times—once for each segment—and have a nested loop that runs five times, picking a random character each time. Here’s what I came up with:
The
$tokens string contains the characters that are valid in the key, so the loop can pick from it. The $segment_chars and $num_segments variables are the number of characters in a segment and the number of segments in the key, respectively. $key_string is an empty string that the loop will add the characters into.
The first for loop runs four times, assuming the desired result is four segments in the key. The inner loop picks a character out of
$tokens at random each time it goes around. (PHP strings are also arrays, with the each character having its own numerical offset.) The characters are tacked onto the $segment string.
Then the segment is joined with the
$key_string , and a dash character is applied if the loop isn’t on the final segment yet. End result: something like H8OV7-HNTB5-JLLOH-W8FG2 .
Now how can you make sure the key is unique when it’s generated?
Best Practice To Generate String Key Javascript File
You generate a new key string with the function, check to see if it exists in your database, and lather/rinse/repeat until that is no longer the case. Usually you won’t have collisions too often, so it will only need to run once. I’m too lazy to figure out the probability, but considering there are 52,521,875 possible combinations for one 5-character segment…you’re probably not going to run into performance issues anytime soon. And if you do, just add another segment onto your key strings.
Jun 16, 2009 24 JavaScript Best Practices for Beginners by Jeffrey Way. Never pass a string to SetInterval and SetTimeOut. Instead, pass a function name. There are multiple ways to create objects in JavaScript. Perhaps the more traditional method is to use the 'new' constructor, like so.
Avoid global variables, avoid
new , avoid , avoid eval()
Avoid Global Variables
Minimize the use of global variables.
This includes all data types, objects, and functions.
Global variables and functions can be overwritten by other scripts.
Use local variables instead, and learn how to use closures.
Always Declare Local Variables
All variables used in a function should be declared as local variables.
Local variables must be declared with the
var keyword or the let keyword, otherwise they will become global variables.
Declarations on Top
It is a good coding practice to put all declarations at the top of each script or function.
This will:
// Declare at the beginning
var firstName, lastName, price, discount, fullPrice; // Use later firstName = 'John'; lastName = 'Doe'; price = 19.90; discount = 0.10; fullPrice = price + discount;
This also goes for loop variables:
// Declare at the beginning
var i; // Use later for (i = 0; i < 5; i++) {
By default, JavaScript moves all declarations to the top (JavaScript Hoisting).
First, what you defining as public key and private key are actually a bitcoin address and a private key encoded in Wallet Import Format (WIF). In order to check that the WIF and the bitcoin addresses are from the same key pair, we will need to decode the private key from its WIF format (checking that the encoding is ok), derive the public key from the private key, and generate the bitcoin. Generate public address from private key bitcoin. On the Bitcoin wiki it has steps to convert a private key to WIF. So I tried following these steps in attempt to get the same result. So I took the private key. Jan 30, 2018 Generate your own private key (5 lines of python) A few lines of python. Perhaps useful for the paranoid. easy to run this on disconnected bootable thumb drive. Vanity-ETH cannot and will never store your private key, and if you don't trust it, you have 3 ways to ensure your key remains private: - Once the web page is loaded, you can turn off the internet and continue playing, it will work seamlessly.
Initialize Variables
It is a good coding practice to initialize variables when you declare them.
This will:
// Declare and initiate at the beginning
var firstName = ', lastName = ', price = 0, discount = 0, fullPrice = 0, myArray = [], myObject = {};
Initializing variables provides an idea of the intended use (and intended data type).
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Never Declare Number, String, or Boolean Objects
Always treat numbers, strings, or booleans as primitive values. Not as objects.
Declaring these types as objects, slows down execution speed, and produces nasty side effects:
Example
var x = 'John'; Try it Yourself »
var y = new String('John'); (x y) // is false because x is a string and y is an object.
Or even worse:
Example
var x = new String('John'); Try it Yourself »
var y = new String('John'); (x y) // is false because you cannot compare objects. Don't Use new Object()
Example
var x1 = {}; // new object Try it Yourself »
var x2 = '; // new primitive string var x3 = 0; // new primitive number var x4 = false; // new primitive boolean var x5 = []; // new array object var x6 = /()/; // new regexp object var x7 = function(){}; // new function object Beware of Automatic Type Conversions
Beware that numbers can accidentally be converted to strings or
NaN (Not a Number).
JavaScript is loosely typed. A variable can contain different data types, and a variable can change its data type:
Example
var x = 'Hello'; // typeof x is a string Try it Yourself »
x = 5; // changes typeof x to a number
When doing mathematical operations, JavaScript can convert numbers to strings:
Example
var x = 5 + 7; // x.valueOf() is 12, typeof x is a number Try it Yourself »
var x = 5 + '7'; // x.valueOf() is 57, typeof x is a string var x = '5' + 7; // x.valueOf() is 57, typeof x is a string var x = 5 - 7; // x.valueOf() is -2, typeof x is a number var x = 5 - '7'; // x.valueOf() is -2, typeof x is a number var x = '5' - 7; // x.valueOf() is -2, typeof x is a number var x = 5 - 'x'; // x.valueOf() is NaN, typeof x is a number
Subtracting a string from a string, does not generate an error but returns
NaN (Not a Number):
ExampleTry it Yourself »Use Comparison
The comparison operator always converts (to matching types) before comparison.
The operator forces comparison of values and type:
Example
0 '; // true Try it Yourself »
1 '1'; // true 1 true; // true 0 '; // false 1 '1'; // false 1 true; // false Use Parameter Defaults
If a function is called with a missing argument, the value of the missing argument is set to
undefined .
Undefined values can break your code. It is a good habit to assign default values to arguments.
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Example
function myFunction(x, y) { Try it Yourself »
if (y undefined) { y = 0; } }
ECMAScript 2015 allows default parameters in the function call:
Read more about function parameters and arguments at Function Parameters
End Your Switches with Defaults
Always end your
switch statements with a default . Even if you think there is no need for it.
Example
switch (new Date().getDay()) { Try it Yourself »
case 0: day = 'Sunday'; break; case 1: day = 'Monday'; break; case 2: day = 'Tuesday'; break; case 3: day = 'Wednesday'; break; case 4: day = 'Thursday'; break; case 5: day = 'Friday'; break; case 6: day = 'Saturday'; break; default: day = 'Unknown'; } Avoid Using eval()
The
eval() function is used to run text as code. In almost all cases, it should not be necessary to use it.
Because it allows arbitrary code to be run, it also represents a security problem.
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