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 …

Web programming: AngularJS, part 2 Read more »

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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 »

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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 »

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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 »

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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 »

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