set js
// Use to remove duplicate elements from the array
const numbers = [2,3,4,4,2,3,3,4,4,5,5,6,6,7,5,32,3,4,5]
//spreading numbers of the object into an array using the new operator
console.log([...new Set(numbers)])
// [2, 3, 4, 5, 6, 7, 32]set in javascript
let mySet = new Set()
mySet.add(1) // Set [ 1 ]
mySet.add(5) // Set [ 1, 5 ]
mySet.add(5) // Set [ 1, 5 ]
mySet.add('some text') // Set [ 1, 5, 'some text' ]
let o = {a: 1, b: 2}
mySet.add(o)
mySet.add({a: 1, b: 2}) // o is referencing a different object, so this is okay
mySet.has(1) // true
mySet.has(3) // false, since 3 has not been added to the set
mySet.has(5) // true
mySet.has(Math.sqrt(25)) // true
mySet.has('Some Text'.toLowerCase()) // true
mySet.has(o) // true
mySet.size // 5
mySet.delete(5) // removes 5 from the set
mySet.has(5) // false, 5 has been removed
mySet.size // 4, since we just removed one value
console.log(mySet)
// logs Set(4) [ 1, "some text", {…}, {…} ] in Firefox
// logs Set(4) { 1, "some text", {…}, {…} } in Chromeset in javascript
// set is used for storing unique values
const firstSet = new Set([1, 2, 3]);
firstSet.add('hi'); //adding value to set
firstSet.add(3); //this will not give any error and it will also not be added
firstSet.delete('hi');//removing value from set
console.log(firstSet.has('hi'));//checking 'hi' is in the set or not
// showing all values in the set
console.log(firstSet);
for (const entry of firstSet.values()) {
console.log(entry);what is new set in javascript
A set is a collection of items which are unique i.e no element can be repeated.
Set in ES6 are ordered: elements of the set can be iterated in the insertion
order. Set can store any types of values whether primitive or objects.
var set4 = new Set();set method in javascript
const language = {
set current(name) {
this.log.push(name);
},
log: []
};
language.current = 'EN';
language.current = 'FA';
console.log(language.log);
// expected output: Array ["EN", "FA"]result set methods
next() -> moves to next row
previous() -> moves to previous row
getObject() -> reads data from column
first() -> jumps to first row
last() -> jumps to last row
absolute(int row) -> go to specific row
beforeFirst()-> jumps to row 0.
Used to call next() method in while loop
getRow() -> returns index of current rowCopyright © 2021 Codeinu
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