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Front End Technology Articles
Page 171 of 652
Add time to string data/time - JavaScript?
In JavaScript, you can add time to a date/time string using the Date object's built-in methods. This is useful for calculating future times or adjusting existing timestamps. Basic Approach First, create a Date object from your string, then use methods like setHours(), setMinutes(), or setSeconds() combined with their getter counterparts to add time. var dateValue = new Date("2021-01-12 10:10:20"); dateValue.setHours(dateValue.getHours() + 2); // Add 2 hours Example: Adding Hours to Date String var dateValue = new Date("2021-01-12 10:10:20"); console.log("Original date: " + dateValue.toString()); // Add 2 hours dateValue.setHours(dateValue.getHours() + 2); ...
Read MoreHow to sort array by first item in subarray - JavaScript?
In JavaScript, you can sort an array of subarrays based on the first element of each subarray using the sort() method with a custom comparison function. The Problem Consider an array where each element is itself an array, and you want to sort by the first item in each subarray: var studentDetails = [ [89, "John"], [78, "Mary"], [94, "Alice"], [47, "Bob"], [33, "Carol"] ]; Sorting in Descending Order To sort by the ...
Read MoreHow to decrease size of a string by using preceding numbers - JavaScript?
Let's say our original string is the following with repeated letters − var values = "DDAAVIDMMMILLERRRRR"; We want to remove the repeated letters and precede letters with numbers. For this, use replace() along with regular expression. Syntax string.replace(/(.)\1+/g, match => match.length + match[0]) How It Works The regular expression /(.)\1+/g matches any character followed by one or more repetitions of the same character. The replacement function returns the count plus the original character. Example Following is the code − var values = "DDAAVIDMMMILLERRRRR"; var precedingNumbersInString = ...
Read MoreReplace multiple instances of text surrounded by specific characters in JavaScript?
Let's say we have a string where certain text is surrounded by special characters like hash (#). We need to replace these placeholders with actual values. var values = "My Name is #yourName# and I got #marks# in JavaScript subject"; We need to replace the special character placeholders with valid values. For this, we use replace() along with shift(). Using replace() with shift() The replace() method with a regular expression can find all instances of text surrounded by hash characters. The shift() method removes and returns the first element from an array, making it ...
Read MoreWhat is the "get" keyword before a function in a class - JavaScript?
The get keyword in JavaScript creates a getter method that allows you to access a function like a property. When you call the getter, it executes the function and returns its value without using parentheses. Syntax class ClassName { get propertyName() { // return some value } } Basic Example Here's how to define and use a getter method: class Employee { constructor(name) { ...
Read MoreGet the correct century from 2-digit year date value - JavaScript?
When working with 2-digit year values, you need to determine which century they belong to. A common approach is using a pivot year to decide between 19XX and 20XX centuries. Example Following is the code − const yearRangeValue = 18; const getCorrectCentury = dateValues => { var [date, month, year] = dateValues.split("-"); var originalYear = +year > yearRangeValue ? "19" + year : "20" + year; return new Date(originalYear + "-" + month + "-" + date).toLocaleDateString('en-GB') }; console.log(getCorrectCentury('10-JAN-19')); console.log(getCorrectCentury('10-JAN-17')); console.log(getCorrectCentury('10-JAN-25')); ...
Read MoreHow to merge specific elements inside an array together - JavaScript
When working with arrays containing mixed data types, you might need to merge consecutive numeric elements while keeping certain separators intact. This is common when processing data that represents grouped numbers. Let's say we have the following array: var values = [7, 5, 3, 8, 9, '/', 9, 5, 8, 2, '/', 3, 4, 8]; console.log("Original array:", values); Original array: [7, 5, 3, 8, 9, '/', 9, 5, 8, 2, '/', 3, 4, 8] Using join() and split() Method To merge specific elements while preserving separators, we can use join(), split(), ...
Read MoreWrap object properties of type string with arrays - JavaScript
When working with objects, you may need to ensure all properties are arrays. This is useful for normalizing data structures where some properties might be strings while others are already arrays. The Problem Consider an object where some properties are strings and others are arrays. To process them uniformly, you need all properties to be arrays: var details = { name: ["John", "David"], age1: "21", age2: "23" }; console.log("Original object:"); console.log(details); Original object: { name: [ ...
Read MoreArray filtering using first string letter in JavaScript
Suppose we have an array that contains names of some people like this: const arr = ['Amy', 'Dolly', 'Jason', 'Madison', 'Patricia']; console.log(arr); [ 'Amy', 'Dolly', 'Jason', 'Madison', 'Patricia' ] We are required to write a JavaScript function that takes in one such array as the first argument, and two lowercase alphabet characters as second and third arguments. Then, our function should filter the array to contain only those elements that start with alphabets that fall within the range specified by the second and third arguments. Therefore, if the second and third arguments ...
Read MoreNumber of vowels within an array in JavaScript
We are required to write a JavaScript function that takes in an array of strings, (they may be a single character or greater than that). Our function should simply count all the vowels contained in the array. Example Let us write the code − const arr = ['Amy', 'Dolly', 'Jason', 'Madison', 'Patricia']; const countVowels = (arr = []) => { const legend = 'aeiou'; const isVowel = c => legend.includes(c.toLowerCase()); let count = 0; arr.forEach(el => { for(let ...
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