Oracle Tutoring, Campbell River, BC
(250) 203-6544 (text) or (250) 830-0295 (talk)
Self-tutoring about JavaScript: the tutor continues about objects and the prototype connection. It’s my understanding that in “old” JavaScript, you could have objects but they were defined using a constructor function, such as function theObj(the_name){ this.name=the_name; } var myObj=new theObj(‘Smedley’); …
Self-tutoring about JavaScript: the tutor begins about its prototype concept. Whether JavaScript has always been truly object-oriented I will discuss over a few posts. Suffice it to say it’s changed a lot over the years to become more similar, syntactically, …
Self-tutoring about JavaScript: the tutor mentions the object window.location JavaScript has the window.location object, which contains information about the current page open in the browser. For instance, window.location.origin will give the url of the current page. Source: w3schools.com
Self-tutoring about regular expressions with JavaScript: the tutor mentions the idea of the boundary condition. In JavaScript regex, a boundary condition can mean a whitespace or punctuation before or after a word. That’s my understanding, anyway. Source: developer.mozilla.org
The tutor shows an example of AngularJS in action, with JavaScript’s Math.pow(x,y) function. JavaScript’s function Math.pow(3,4) evaluates 34, giving the answer 81. In that expression, 3 is the base, while 4 is the exponent. Below, you can input a base …
The tutor describes the difference between substr() and substring() Let’s imagine the string variable var strng_ex=”this_example_string”; The function substr(4,5) returns 5 characters from the string, starting at the fourth position (which is _, since the first position is 0): strng_ex.substr(4,5) …
JavaScript: string functions: substr() vs substring() Read more »
The tutor shares an observation about the concat() function. The concat() function is used to join one or more strings to the end of another: var strng0 = “This string, “; var strng1 = “then this one” var strng2 = …
JavaScript: literal string with the concat() function Read more »
The tutor shows an example of a wrapper program in action. To my knowledge, a wrapper is a program that hides a function that the managing system can’t handle. The “wrapping” is code that the managing system recognizes as the …
Web design: a JavaScript wrapper for SVG in WordPress Read more »
The tutor comments on JavaScript null and undefined. Null, it seems, is often mentioned in computer science. Perhaps it’s used a little loosely: it might refer to the value read when there’s nothing there, or the value of a variable …
Computer science: JavaScript: null value, undefined type and value Read more »
The tutor offers a fun demo with a couple of string functions and setInterval. Source: w3schools w3schools Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.