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Programming Scripts Articles
Page 24 of 33
How to stop the execution of a function with JavaScript?
To stop the execution of a function in JavaScript, use the clearTimeout() method. This function call clears any timer set by the setTimeout() functions.ExampleYou can try to run the following code to learn how to work with clearTimeout() method in JavaScript. JavaScript clearTimeout() method Click the buttons below to handle animation
Read MoreWhat is the usage of an abort event in JavaScript?
Use the on abort event to abort the loading of an image. You can try to run the following code to learn how to implement an abort event in JavaScript.Example function abortFunc() { alert('Error- Loading of the image aborted'); }
Read MoreWhat is the role of scrollX property in JavaScript?
The scrollX property in JavaScript works the same as pageXoffset property. If you want to get the pixels the document scrolled to from the upper left corner of the window, then use the scrollX property for horizontal pixels.ExampleYou can try to run the following code to learn how to work with scrollX property in JavaScript. div { background-color: yellow; height: 1500px; width: 1500px; } function scrollFunc() { window.scrollBy(200, 200); alert("Horizontal: " + window.scrollX); } Scroll
Read MoreHow to return a random number between 0 and 199 with JavaScript?
To return a random number between 0 and 199, use the JavaScript Math.random() and Math.floor() method.ExampleYou can try to run the following code to return a random number in JavaScript. document.write(Math.floor(Math.random() * 200));
Read MoreIs it a good practice to place all declarations at the top in JavaScript?
Yes, it is a good practice to place all the JavaScript declarations at the top. Let’s see an example −Example JavaScript String match() Method // all the variables declared at top var str, re, found; str = "For more information, see Chapter 3.4.5.1"; re = /(chapter \d+(\.\d)*)/i; found = str.match( re ); document.write(found ); The following are the valid reasons −Gives a single place to check for all the variables.Helps in avoiding global variablesRe-declarations are avoided.The code is easy to read for others as well.
Read MoreWhat will happen if a semicolon is misplaced in JavaScript?
If a semicolon is misplaced in JavaScript, then it may lead to misleading results. Let’s see an example, wherein the if statement condition is false, but due to misplaced semi-colon, the value gets printed.Example var val1 = 10; if (val1 == 15) { document.write("Prints due to misplaced semi-colon: "+val1); } var val2 = 10; if (val2 == 15) { // this won't get printed document.write(val2); }
Read MoreDifference between Relational Algebra and Relational Calculus
Relational AlgebraRelational algebra is a procedural query language, which takes instances of relations as input and yields instances of relations as output. It uses operators to perform queries. An operator can be either unary or binary. They accept relations as their input and yield relations as their output. Relational algebra is performed recursively on a relation and intermediate results are also considered relations.The fundamental operations of relational algebra are as follows -SelectProjectUnionSet differentCartesian productRenameRelational CalculusIn contrast to Relational Algebra, Relational Calculus is a non-procedural query language, that is, it tells what to do but never explains how to do it.Relational ...
Read MoreHow can we combine multiple print statements per line in Python?
You can combine multiple print statements per line using, in Python 2 and use the end argument to print function in Python 3.examplePython2.x print "Hello", print " world" Python3.x print ("Hello", end='') print (" world")OutputThis will give the output −Hello worldAnother thing you could do is put all the things in an array and call ''.join(array). examplearr = ["Hello", "world"] print(' '.join(arr))OutputThis will give the output −Hello world
Read MoreWhat are Python coding standards/best practices?
You can use the PEP8 guide as a holy grail. Almost all python world uses this guide to write clean understandable and standard python code. This is available as an extension as a linter for all modern text editors. You can check it out at http://www.python.org/dev/peps/pep-0008/Properly Structure your folders. All projects need proper structuring. This helps organize code better. Python has an opinionated folder structure that you should use.README.rst LICENSE setup.py requirements.txt sample/__init__.py sample/core.py sample/helpers.py docs/conf.py docs/index.rst tests/test_basic.py tests/test_advanced.pyUse doctests. The doctest module searches for pieces of text that look like interactive Python sessions, and then executes those sessions to ...
Read MoreHow can we print multiple blank lines in python?
We can print multiple blank lines in python by using the character the number of times we need a blank line. For example, If you need 5 blank lines, you can use −Python 2.x: print "" Python 3.x: print("")You can use features like repetition operator in python to make this easier. For example,Python 2.x: print "" * 5 Python 3.x: print("" * 5)All of these commands will print 5 blank lines on the STDOUT.
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