Does anyone know if there’s a good tool for analyzing JavaScript code and detecting type errors? I know that JavaScript itself is weakly and dynamically typed, but it would be really nice if I could have a program that would verify that all my field accesses are sensible and that I don’t try treat…
Tag: javascript
Javascript Math Object Methods – negatives to zero
in Javascript I can’t seem to find a method to set negatives to zero? -90 becomes 0 -45 becomes 0 0 becomes 0 90 becomes 90 Is there anything like that? I have just rounded numbers. Answer Just do something like or or
Is using labels in JavaScript bad practice?
I just found out about using label s in JavaScript, such as: I’ve not heard about this until now and I can’t find much information online about it and I’m beginning to think there is a reason for that. It seems to me like this is similar to a GOTO statement in other languages and would be co…
how to detect if variable is a string
How can I detect if a variable is a string? Answer This is the way specified in the ECMAScript spec to determine the internal [[Class]] property. From 8.6.2 Object Internal Properties and Methods: The value of the [[Class]] internal property is defined by this specification for every kind of built-in object. …
What does u003C mean?
I’m looking at twitter’s javascript file, and I see this in the templates hash: What do those codes represent? Answer It’s a unicode character. In this case u003C and u003E mean : U+003C < Less-than sign U+003E > Greater-than sign See a list here
How to initialize an array’s length in JavaScript?
Most of the tutorials that I’ve read on arrays in JavaScript (including w3schools and devguru) suggest that you can initialize an array with a certain length by passing an integer to the Array constructor using the var test = new Array(4); syntax. After using this syntax liberally in my js files, I ran …
Javascript array sort and unique
I have a JavaScript array like this: I need the array elements to be unique and sorted: Even though the members of array look like integers, they’re not integers, since I have already converted each to be string: Is there any way to do all of these tasks in JavaScript? Answer This is actually very simpl…
How do I create and read a value from cookie with javascript?
How can I create and read a value from a cookie in JavaScript? Answer Here are functions you can use for creating and retrieving cookies.
Chrome sendrequest error: TypeError: Converting circular structure to JSON
I’ve got the following… which calls the following.. However, my code never reaches “ZOMG HERE” but rather throws the following error while running chrome.extension.sendRequest Does anyone have any idea what is causing this? Answer It means that the object you pass in the request (I gue…
Reading a JSP variable from JavaScript
How can I read/access a JSP variable from JavaScript? Answer or or full example Note: sanitize the input before rendering it, it may open whole lot of XSS possibilities