There is nice Array method reduce() to get one value from the Array. Example: What is the best way to achieve the same with objects? I’d like to do this: However, Object does not seem to have any reduce() method implemented. Answer What you actually want in this case are the Object.values. Here is a con…
Tag: javascript
assertEqual error on nodeJs
I just started nodejs development. I am testing mongodb driver but repeatedly getting assertEquals has no method. code from sourceRepo Error has no method ‘assertEquals’ How to reolve it? Answer You can use Node’s Assert for this (where it is called equal rather than equal*s*): However, for …
How to check if an array index exist?
I’m trying to check whether an array index exist in TypeScript, by the following way (Just for example): However, i’m getting the following compilation error: The in operator requires the left operand to be of type Any or the String primitive type, and the right operand to be of type Any or an obj…
Passing Attributes to Append function in Jquery Not Working
I am trying to pass attributes to a jquery append function. It appends the html but does not append the attributes. There are no errors shown in the console either. Html Code : Javascript Code : I want the HTML to look like Answer .append() is a Method which accepts string arguments or a function .append(R…
How do I prevent invalid characters from being entered into a form?
For example, if I have a form and I don’t want the user to enter numbers in it and I validate it with a function containing a regular expression, how do I prevent the invalid character the user entered (in this example, a digit) from showing up in the text form if it fails the regular expression test? T…
Button element not firing click event when clicking on button text and releasing off it (but still inside the button)?
On WebKit browsers (I tested on Chrome and Safari on Mac), button element behaves weird: Wen in this fiddle http://jsfiddle.net/5ReUn/3/ you do the following: Press left mouse button while the cursor is over HTML button text Move the cursor (while pressed) to an area of the button without text Release the mou…
Recursive JavaScript function is losing the return value
I want to search a string in a nested JSON object. If the string found in an object, I need to return that object. I am using a recursive function to achieve this. The problem is, the function is recursing until the end and not returning the object found. Please see the entire code in jsfiddle I am not sure
How to compare value in JavaScript when keyup
I try to compare two string first ASCII (English) and second Unicode (Chinese). User need to type message in textarea and JavaScript will calculate how long the text and show some message. Now its working only for ASCII (English) but I need to compare because condition for ASCII and Unicode is different. Belo…
Replace multiple strings with multiple other strings
I’m trying to replace multiple words in a string with multiple other words. The string is “I have a cat, a dog, and a goat.” However, this does not produce “I have a dog, a goat, and a cat”, but instead it produces “I have a cat, a cat, and a cat”. Is it possible to r…
Filter search for
I have a list of users as well: what I want is a text input each time you write a letter to display only users that start with that letter or that they might have the name. As I can do? It is with jquery but not as … Answer Here is a input that filters a <ul> based on