How to append something to an array?

Use the Array.prototype.push method to append values to the end of an array:  Run code snippet You can use the push() function to append more than one value to an array in a single call:  Run code snippet Update If you want to add the items of one array to another array, you can use firstArray.concat(secondArray):  Run code snippet Update … Read more

How to do associative array/hashing in JavaScript

Use JavaScript objects as associative arrays. Associative Array: In simple words associative arrays use Strings instead of Integer numbers as index. Create an object with JavaScript allows you to add properties to objects by using the following syntax: An alternate syntax for the same is: If you can, also create key-to-value object maps with the following … Read more

Understanding The Modulus Operator %

(This explanation is only for positive numbers since it depends on the language otherwise) Definition The Modulus is the remainder of the euclidean division of one number by another. % is called the modulo operation. For instance, 9 divided by 4 equals 2 but it remains 1. Here, 9 / 4 = 2 and 9 % 4 = 1. In your example: 5 divided by 7 gives 0 but it … Read more

How to define a two-dimensional array?

You’re technically trying to index an uninitialized array. You have to first initialize the outer list with lists before adding items; Python calls this “list comprehension”. #You can now add items to the list: Note that the matrix is “y” address major, in other words, the “y index” comes before the “x index”. Although you … Read more

What does ‘–set-upstream’ do?

To avoid confusion,recent versions of git deprecate this somewhat ambiguous –set-upstream optionin favor of a more verbose –set-upstream-to optionwith identical syntax and behavior. sets the default remote branch for the current local branch. Any future git pull command (with the current local branch checked-out),will attempt to bring in commits from the <remote-branch> into the current local branch. One way to avoid having to explicitly type –set-upstream / –set-upstream-to is … Read more

Iterating over dictionaries using ‘for’ loops

key is just a variable name. will simply loop over the keys in the dictionary, rather than the keys and values. To loop over both key and value you can use the following: For Python 3.x: For Python 2.x: To test for yourself, change the word key to poop. In Python 3.x, iteritems() was replaced with simply items(), which returns a set-like … Read more

Understanding slice notation

It’s pretty simple really: There is also the step value, which can be used with any of the above: The key point to remember is that the :stop value represents the first value that is not in the selected slice. So, the difference between stop and start is the number of elements selected (if step is 1, the default). The other feature is that start or stop may be a negative number, which … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)