Javascript Examples

Button Reusable

function Button({ label, onClick }) {

 return <button onClick={onClick}>{label}</button>;

// Usage <Button label="Submit" onClick={handleSubmit} />

Get Day of week

const getDayName = (date) => {

 const days = [
   "Sunday",
   "Monday",
   "Tuesday",
   "Wednesday",
   "Thursday",
   "Friday",
   "Saturday",
 ];
 return days[date.getDay()];

}; console.log(getDayName(new Date())); // Friday

Get date

const getDate = () => new Date(); console.log(getDate()); // 2020-05-25T09:57:37.869Z

Convert to Object

const toObject = (arr) => ({ ...arr }); console.log(toObject(["a", "b"])); // { 0: 'a', 1: 'b' }

Remove Duplicates

const removeDuplicated = (arr) => [...new Set(arr)]; console.log(removeDuplicated([1, 2, 3, 3, 4, 4, 5, 5, 6])); // Result: [ 1, 2, 3, 4, 5, 6 ]

const removeDuplicate = (arr) =>

 Object.values(arr.reduce((a, b) => (a[b] ? a : { ...a, [b]: b }), {}));

console.log(removeDuplicate([1, 2, 3, 3])); // Result: [ 1, 2, 3, ] // program to check the number of occurrence of a character

function countString(str, letter) {

   let count = 0;

   // looping through the items
   for (let i = 0; i < str.length; i++) {

       // check if the character is at that position
       if (str.charAt(i) == letter) {
           count += 1;
       }
   }
   return count;

} // take input from the user const string = prompt('Enter a string: '); const letterToCheck = prompt('Enter a letter to check: ');

//passing parameters and calling the function const result = countString(string, letterToCheck);

// displaying the result console.log(result);SORT words in alphabetical order

// take input
const string = prompt('Enter a sentence: ');
// converting to an array
const words = string.split(' ');
// sort the array elements
words.sort();
// display the sorted words
console.log('The sorted words are:');
for (const element of words) {
console.log(element);

}