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is there any efficient way to do this in JavaScript? I compared the for, forEach and reduce efficiency using console.time utility. And found that for is faster among the three for the same data. …

return str === reversedStr; See Which equals operator (== vs ===) should be used in JavaScript comparisons? …

Number of functions 2n You're creating two functions per image one to handle mouseenter event and other to handle mouseout event. If you look at the mouseenter handler of all the images, you'll notic …

You can use Array#filter to get elements from array which are not present in other array. var a = [2, 4, 8, 16, 32], b = [2, 4, 32, 64, 128, 256]; // Define custom method on Array prototype …

Create a function on Array.prototype that'll accept an array and filter the array by checking if the element is in the other array. // Define a function on Array prototype Array.prototype.arrayDiff = …

</span> <span class="cover_letter_suggestion_add_button"> <button class="btn btn-xs rounded btn-primary">{% trans "Add" %}</button> </span> </div> Javascript Use common class to bind …

You can use RegEx to extract the sequence of alphabets or numbers. To match alphabets/number, use character class in Regular expression as below /[A-Z]+|[0-9]+/ to match all occurrences, use g(glob …

JavaScript match => map => n * replace In the three functions, you're first using match to get the matches then iterating over it and using replace inside it. This is not at all necessary. … Which equals operator (== vs ===) should be used in JavaScript comparisons? For default values, || can be used instead of ternary. The default value for _array should be [] instead of {}. …

Here are some improvements: Use IIFE. This will make the variables defined inside it private thus avoid cluttering globals Passing window and document objects will make it available in current sco …

Here's the equivalent code. // Check if this element has the specified class if ($(this).hasClass('primary-item-a')) { // If there are one or more visible `ul`s if ($parent_li.siblings().fin …

It's easy and safe than using css() to change the styles of element from JavaScript. This also keep separation of concerns. … See Which equals operator (== vs ===) should be used in JavaScript comparisons? if (pastScroll === currentScroll) { Chaining. jQuery provides feature to chain multiple calls on same elements. …

Core JavaScript has dataset property that allows access to data attributes. … The relation between HTML element-JavaScript handler is reduced from many to many to many to one. …

See JavaScript property access: dot notation vs. brackets? Typo In the object, the keys for movie name has typo. It should be movieName. … ECMAScript 2015 If the target environment support latest version of JavaScript, use the features provided by it. Complete code: if (! …

The below formula can be used to get the LCM of two numbers. See Reduction by the greatest common divisor section in Wikipedia a * b lcm(a, b) = ――――――――――― gcd(a, b) GC …

See Javascript regex multiline flag doesn't work With these changes the regex will become /(a:link,\s*span\.MsoHyperlink|a:visited,\s*span\.MsoHyperlinkFollowed)[\s\S]*?}/gi Here's demo. …