In javascript how to convert sequence of numbers in an array to range of numbers?  eg. [2,3,4,5,10,18,19,20] to [2-5,10,18-20]...
Some events in JavaScript fire before others. For example, with an input element, the keydown and keypress events fire first. Then, if the return value from those was not false, the input.value is updated. Then, the keyup event fires.  Is there a web...
I'm trying to come up with an efficient algorithm that would work in JavaScript for the longest common subsequence problem. However, there are two main differences between my problem and the one described in the Wikipedia article. The first is th...
Please help me explain why log result is different in 2 ways:  Way 1: Log sequentially every 1 second  Way 2: After 1 second all elements are logged.  // Way 1 let sequence = Promise.resolve(); [1,2,3,4].forEach((val)=> {     sequence = sequence.t...
Hi I have to find a missing number in an xml file. but I feel difficulty to find. Pls suggest some ideas.    Example  A file contains an <a> tag which include id i.e page-1,2... I need to find the missing numbers using jquery.  a.xml    <p&g...
I have followed this tutorial and come up with that code:  context = new AudioContext(); play(frequency) {     const o = this.context.createOscillator();     const g = this.context.createGain();     o.connect(g);     g.connect(this.context.destinatio...
I am trying to figure out how to find the first missing number of a sequence of numbers like this (1,2,3,5,6,9,10,15)  I want to put the first missing number, #4, into an variable for later use but don't know how to do so?  I have tried this but...
I have very long integer sequences that look like this (arbitrary length!):   0000000001110002220033333   Now I need some algorithm to convert this string into something compressed like   a9b3a3c3a2d5   Which means "a 9 times, then b 3 times, the...
here's the snippet of my code :  <ul>     <li><a href="home">Home</a></li>     <li><a href="links">Links</a></li>     <li><a href="contact">Contact</a>...
My head isn't quite with me and hope somebody can assist...  Let's say I have:  1234567   I wish to generate a list of all possible combinations, the only restrictions are that:   A number can only appear once A higher number can't come b...

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