js string contains substring ignore case

ByAnurag batra October 2, 2022September 6, 2022

const str = 'arya stark';

// The most concise way to check substrings ignoring case is using
// `String#match()` and a case-insensitive regular expression (the 'i')
str.match(/Stark/i); // true
str.match(/Snow/i); // false

// You can also convert both the string and the search string to lower case.
str.toLowerCase().includes('Stark'.toLowerCase()); // true
str.toLowerCase().indexOf('Stark'.toLowerCase()) !== -1; // true

str.toLowerCase().includes('Snow'.toLowerCase()); // false
str.toLowerCase().indexOf('Snow'.toLowerCase()) !== -1; // false

Here is what the above code is Doing:
1. `str.toLowerCase()` converts the string to lower case.
2. `’Stark’.toLowerCase()` converts the search string to lower case.
3. `str.toLowerCase().includes(‘Stark’.toLowerCase())` checks if the lower case
string includes the lower case search string.
4. `str.toLowerCase().indexOf(‘Stark’.toLowerCase()) !== -1` checks if the lower
case string includes the lower case search string.

eliminare spazi inizio e fine stringa javascript

Javascript Examples

eliminare spazi inizio e fine stringa javascript

ByAnurag batra October 12, 2022September 6, 2022

let name = ” Mike “; console.log(name.trim()); // output: “Mike” Here is what the above code is Doing: 1. We create a variable called name and assign it the value ” Mike “. 2. We then call the trim() method on the name variable. 3. The trim() method removes all the whitespace from the beginning…

Javascript Examples

update npm packages

ByAnurag batra July 18, 2022October 23, 2022

npm i -g npm-check-updates ncu -u npm install Here is what the above code is Doing: 1. Install the npm-check-updates package globally. 2. Run the ncu command to update the package.json file. 3. Run npm install to install the new versions of the packages.

how to get mobile preferences is it dark or light using javascript

Javascript Examples

how to get mobile preferences is it dark or light using javascript

ByAnurag batra September 21, 2022September 6, 2022

if (window.matchMedia && window.matchMedia(‘(prefers-color-scheme: dark)’).matches) { // dark mode } window.matchMedia(‘(prefers-color-scheme: dark)’).addEventListener(‘change’, e => { const newColorScheme = e.matches ? “dark” : “light”; }) Here is what the above code is Doing: 1. Check if the browser supports the prefers-color-scheme media query. 2. If it does, check if the user has dark mode enabled. 3….

Javascript Examples

rect to rect collision

ByAnurag batra October 5, 2022September 6, 2022

var rect1 = {x: 5, y: 5, width: 50, height: 50} var rect2 = {x: 20, y: 10, width: 10, height: 10} if (rect1.x < rect2.x + rect2.width && rect1.x + rect1.width > rect2.x && rect1.y < rect2.y + rect2.height && rect1.y + rect1.height > rect2.y) { // collision detected! } // filling in the…

json2csv parse with flatten example javascript

Javascript Examples

json2csv parse with flatten example javascript

ByAnurag batra October 7, 2022September 6, 2022

const { Parser } = require(‘json2csv’); const json2csvParser = new Parser({ unwind: paths, unwindBlank: true, flatten: true, flattenSeparator: ‘__’ }); const csv = json2csvParser.parse(myData); Here is what the above code is Doing: 1. We’re using the json2csv package to parse our data. 2. We’re using the unwind option to specify the paths we want to…

Javascript Examples

js get part of array

ByAnurag batra July 31, 2022June 30, 2022

let fruits = [‘Banana’, ‘Orange’, ‘Lemon’, ‘Apple’, ‘Mango’] let citrus = fruits.slice(1, 3) // fruits contains [‘Banana’, ‘Orange’, ‘Lemon’, ‘Apple’, ‘Mango’] // citrus contains [‘Orange’,’Lemon’] Here is what the above code is Doing: 1. The original array is copied to a new array. 2. The new array is sorted. 3. The sorted array is displayed….

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