JavaScript ะœะตั‚ะพะดั‹ ะฟั€ะธะผะธั‚ะธะฒะพะฒ

ะ’ JavaScript ะผะพะถะฝะพ ั€ะฐะฑะพั‚ะฐั‚ัŒ ั ะฟั€ะธะผะธั‚ะธะฒะฐะผะธ (ั‡ะธัะปะฐะผะธ, ัั‚ั€ะพะบะฐะผะธ ะธ ะดั€.), ะบะฐะบ ะตัะปะธ ะฑั‹ ะพะฝะธ ะฑั‹ะปะธ ะพะฑัŠะตะบั‚ะฐะผะธ.

ะะพ, ั€ะฐะทัƒะผะตะตั‚ัั, ะตัั‚ัŒ ะทะฐะผะตั‚ะฝั‹ะต ั€ะฐะทะปะธั‡ะธั ะผะตะถะดัƒ ะพะฑัŠะตะบั‚ะฐะผะธ ะธ ะฟั€ะธะผะธั‚ะธะฒะฐะผะธ.

ะŸะพัั‚ะพะผัƒ, ะฟั€ะธะผะธั‚ะธะฒ - ัั‚ะพ ะทะฝะฐั‡ะตะฝะธะต ะฟั€ะธะผะธั‚ะธะฒะฝะพะณะพ ั‚ะธะฟะฐ. ะกัƒั‰ะตัั‚ะฒัƒะตั‚ ัะตะผัŒ ั‚ะธะฟะพะฒ ะฟั€ะธะผะธั‚ะธะฒะพะฒ, ัั€ะตะดะธ ะบะพั‚ะพั€ั‹ั…: ั‡ะธัะปะพ, bigint, ัะธะผะฒะพะป, ัั‚ั€ะพะบะฐ, ะปะพะณะธั‡ะตัะบะพะต ะทะฝะฐั‡ะตะฝะธะต, null ะธ undefined. ะžะฑัŠะตะบั‚ ะผะพะถะตั‚ ั…ั€ะฐะฝะธั‚ัŒ ะฝะตัะบะพะปัŒะบะพ ะทะฝะฐั‡ะตะฝะธะน ะฒ ะฒะธะดะต ัะฒะพะนัั‚ะฒ. ะ’ั‹ ะผะพะถะตั‚ะต ัะพะทะดะฐั‚ัŒ ะพะฑัŠะตะบั‚, ะธัะฟะพะปัŒะทัƒั {}. ะะฐะฟั€ะธะผะตั€:

{
  name: "Chevrolet",
  model: "Camaro",
  price: 40000
}

ะ’ JavaScript ััƒั‰ะตัั‚ะฒัƒัŽั‚ ะธ ะดั€ัƒะณะธะต ะฒะธะดั‹ ะพะฑัŠะตะบั‚ะพะฒ. ะะฐะฟั€ะธะผะตั€, ั„ัƒะฝะบั†ะธะธ ั‚ะฐะบะถะต ัั‡ะธั‚ะฐัŽั‚ัั ะพะฑัŠะตะบั‚ะฐะผะธ.

ะžะดะฝะธะผ ะธะท ะฝะฐะธะฑะพะปะตะต ะทะฝะฐั‡ะธั‚ะตะปัŒะฝั‹ั… ะฟั€ะตะธะผัƒั‰ะตัั‚ะฒ ะพะฑัŠะตะบั‚ะพะฒ ัะฒะปัะตั‚ัั ะฒะพะทะผะพะถะฝะพัั‚ัŒ ั…ั€ะฐะฝะตะฝะธั ั„ัƒะฝะบั†ะธะธ ะฒ ะบะฐั‡ะตัั‚ะฒะต ะพะดะฝะพะณะพ ะธะท ะตะณะพ ัะฒะพะนัั‚ะฒ.

ะะฐะฟั€ะธะผะตั€:

Javascript object's function properties
let site = {
name: "W3Docs",
welcome: function () {
console.log("Welcome to W3Docs!");
}
};
site.welcome(); // Welcome to W3Docs!
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ะกัƒั‰ะตัั‚ะฒัƒะตั‚ ะผะฝะพะถะตัั‚ะฒะพ ะฒัั‚ั€ะพะตะฝะฝั‹ั… ะพะฑัŠะตะบั‚ะพะฒ. ะะฐะฟั€ะธะผะตั€, ั‚ะต, ะบะพั‚ะพั€ั‹ะต ั€ะฐะฑะพั‚ะฐัŽั‚ ั ะพัˆะธะฑะบะฐะผะธ, ะดะฐั‚ะฐะผะธ, HTML ัะปะตะผะตะฝั‚ะฐะผะธ ะธ ะดั€. ะžะฝะธ ะฒะบะปัŽั‡ะฐัŽั‚ ั€ะฐะทะปะธั‡ะฝั‹ะต ะผะตั‚ะพะดั‹ ะธ ัะฒะพะนัั‚ะฒะฐ.

ะะพ, ัƒั‡ั‚ะธั‚ะต, ั‡ั‚ะพ ะพะฑัŠะตะบั‚ะฐะผ ั‚ั€ะตะฑัƒัŽั‚ัั ะดะพะฟะพะปะฝะธั‚ะตะปัŒะฝั‹ะต ั€ะตััƒั€ัั‹ ะดะปั ะฟะพะดะดะตั€ะถะบะธ ะฒะฝัƒั‚ั€ะตะฝะฝะตะน ะผะตั…ะฐะฝะธะบะธ.

ะŸั€ะธะผะธั‚ะธะฒ ะบะฐะบ ะพะฑัŠะตะบั‚

ะะธะถะต ะพะฟะธัะฐะฝ ะฟะฐั€ะฐะดะพะบั JavaScript:

  • ะฅะพั‚ะตะปะพััŒ ะฑั‹ ะดะตะปะฐั‚ัŒ ะผะฝะพะณะพะต ั ะฟั€ะธะผะธั‚ะธะฒะฐะผะธ, ั‚ะฐะบะธะผะธ ะบะฐะบ ัั‚ั€ะพะบะธ ะธ ั‡ะธัะปะฐ. ะ”ะพัั‚ัƒะฟ ะบ ะฝะธะผ ั‡ะตั€ะตะท ะผะตั‚ะพะดั‹ ะฑั‹ะป ะฑั‹ ะพั‚ะปะธั‡ะฝั‹ะผ ั€ะตัˆะตะฝะธะตะผ.
  • ะŸั€ะธะผะธั‚ะธะฒั‹ ะดะพะปะถะฝั‹ ะฑั‹ั‚ัŒ ะปะตะณะบะธะผะธ ะธ ะฑั‹ัั‚ั€ั‹ะผะธ.

ะ˜ ะฒะพั‚ ั€ะตัˆะตะฝะธะต, ะบะพั‚ะพั€ะพะต ะผะพะถะตั‚ ะฟะพะบะฐะทะฐั‚ัŒัั ะฝะตัะบะพะปัŒะบะพ ัั‚ั€ะฐะฝะฝั‹ะผ:

  • ะŸั€ะธะผะธั‚ะธะฒั‹ ะพัั‚ะฐัŽั‚ัั ะฟั€ะธะผะธั‚ะธะฒะฐะผะธ. ะžะดะฝะพ ะทะฝะฐั‡ะตะฝะธะต, ะบะฐะบ ะธ ั…ะพั‚ะตะปะพััŒ.
  • ะ’ ัะทั‹ะบะต ัƒ ะฒะฐั ะตัั‚ัŒ ะดะพัั‚ัƒะฟ ะบ ัะฒะพะนัั‚ะฒะฐะผ ะธ ะผะตั‚ะพะดะฐะผ ัั‚ั€ะพะบ, ัะธะผะฒะพะปะพะฒ, ะปะพะณะธั‡ะตัะบะธั… ะทะฝะฐั‡ะตะฝะธะน ะธ ั‡ะธัะตะป.
  • ะงั‚ะพะฑั‹ ัั‚ะพ ั€ะฐะฑะพั‚ะฐะปะพ, ะณะตะฝะตั€ะธั€ัƒะตั‚ัั ัะฟะตั†ะธะฐะปัŒะฝั‹ะน ยซะพะฑัŠะตะบั‚-ะพะฑะตั€ั‚ะบะฐยป, ะบะพั‚ะพั€ั‹ะน ะฟั€ะตะดะพัั‚ะฐะฒะปัะตั‚ ะดะพะฟะพะปะฝะธั‚ะตะปัŒะฝัƒัŽ ั„ัƒะฝะบั†ะธะพะฝะฐะปัŒะฝะพัั‚ัŒ, ะฐ ะทะฐั‚ะตะผ ัƒะฝะธั‡ั‚ะพะถะฐะตั‚ัั.

ะ”ะปั ะบะฐะถะดะพะณะพ ั‚ะธะฟะฐ ะฟั€ะธะผะธั‚ะธะฒะฐ ััƒั‰ะตัั‚ะฒัƒะตั‚ ัะฒะพะน ัะพะฑัั‚ะฒะตะฝะฝั‹ะน ยซะพะฑัŠะตะบั‚-ะพะฑะตั€ั‚ะบะฐยป ะฟะพะด ะฝะฐะทะฒะฐะฝะธะตะผ: Number, Boolean, String, Symbol. ะžะฝะธ ะฟั€ะตะดะพัั‚ะฐะฒะปััŽั‚ ั€ะฐะทะปะธั‡ะฝั‹ะต ะฝะฐะฑะพั€ั‹ ะผะตั‚ะพะดะพะฒ. ะะฐะฟั€ะธะผะตั€, ะตัั‚ัŒ ะผะตั‚ะพะด ัั‚ั€ะพะบะธ str.toUpperCase(), ะฒะพะทะฒั€ะฐั‰ะฐัŽั‰ะธะน ะฟั€ะพะฟะธัะฝัƒัŽ str.

ะญั‚ะพ ั€ะฐะฑะพั‚ะฐะตั‚ ั‚ะฐะบ:

Javascript string toUpperCase method
let str = "Welcome to W3Docs";
console.log(str.toUpperCase()); // WELCOME TO W3DOCS
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ะขะตะฟะตั€ัŒ ะดะฐะฒะฐะนั‚ะต ะฟะพัะผะพั‚ั€ะธะผ, ั‡ั‚ะพ ะฟั€ะพะธัั…ะพะดะธั‚ ะฒ str.toUpperCase():

  • str - ัั‚ะพ ะฟั€ะธะผะธั‚ะธะฒ. ะ’ ะผะพะผะตะฝั‚ ะดะพัั‚ัƒะฟะฐ ะบ ะตะณะพ ัะฒะพะนัั‚ะฒัƒ ัะพะทะดะฐะตั‚ัั ัƒะฝะธะบะฐะปัŒะฝั‹ะน ะพะฑัŠะตะบั‚. ะญั‚ะพั‚ ะพะฑัŠะตะบั‚ ะทะฝะฐะตั‚ ะทะฝะฐั‡ะตะฝะธะต ัั‚ั€ะพะบะธ ะธ ะธะผะตะตั‚ ะฟะพะปะตะทะฝั‹ะต ะผะตั‚ะพะดั‹, ั‚ะฐะบะธะต ะบะฐะบ toUpperCase().
  • ะญั‚ะพั‚ ะผะตั‚ะพะด ัะฟะพัะพะฑะตะฝ ั€ะฐะฑะพั‚ะฐั‚ัŒ ะธ ะฒะพะทะฒั€ะฐั‰ะฐั‚ัŒ ัะพะฒะตั€ัˆะตะฝะฝะพ ะฝะพะฒัƒัŽ ัั‚ั€ะพะบัƒ (ัั‚ะพ ะฟะพะบะฐะทะฐะฝะพ ั ะฟะพะผะพั‰ัŒัŽ console.log).
  • ะกะฟะตั†ะธะฐะปัŒะฝั‹ะน ะพะฑัŠะตะบั‚ ัƒะฝะธั‡ั‚ะพะถะฐะตั‚ัั, ะธ ะฟั€ะธะผะธั‚ะธะฒ str ะพัั‚ะฐะตั‚ัั ะฒ ะพะดะธะฝะพั‡ะตัั‚ะฒะต.

ะœั‹ ะผะพะถะตะผ ะฟั€ะตะดะฟะพะปะพะถะธั‚ัŒ ั‡ั‚ะพ ะฟั€ะธะผะธั‚ะธะฒั‹ ะฟั€ะตะดะพัั‚ะฐะฒะปััŽั‚ ะผะตั‚ะพะดั‹, ะฝะพ ะพัั‚ะฐัŽั‚ัั ะปะตะณะบะธะผะธ.

ะ’ะฐะถะฝะพ ะพั‚ะผะตั‚ะธั‚ัŒ, ั‡ั‚ะพ JavaScript ะทะฝะฐั‡ะธั‚ะตะปัŒะฝะพ ัƒะปัƒั‡ัˆะฐะตั‚ ัั‚ะพั‚ ะฟั€ะพั†ะตัั. ะ‘ะพะปะตะต ั‚ะพะณะพ, ัะพะทะดะฐะฝะธะต ะดะพะฟะพะปะฝะธั‚ะตะปัŒะฝะพะณะพ ะพะฑัŠะตะบั‚ะฐ ะผะพะถะตั‚ ะฑั‹ั‚ัŒ ะฟั€ะพะฟัƒั‰ะตะฝะพ. ะขะตะผ ะฝะต ะผะตะฝะตะต, ะฝัƒะถะฝะพ ะฟั€ะธะดะตั€ะถะธะฒะฐั‚ัŒัั ัะฟะตั†ะธั„ะธะบะฐั†ะธะธ, ะบะพั‚ะพั€ะฐั ะฒะตะดะตั‚ ัะตะฑั ั‚ะฐะบ, ะบะฐะบ ะฑัƒะดั‚ะพ ะณะตะฝะตั€ะธั€ัƒะตั‚ ะพะดะธะฝ.

ะฃ ั‡ะธัะปะฐ ะตัั‚ัŒ ัะฒะพะธ ะผะตั‚ะพะดั‹. ะ”ะฐะฒะฐะนั‚ะต ะฟะพัะผะพั‚ั€ะธะผ ะฝะฐ ัั‚ะพั‚ ะฟั€ะธะผะตั€:

Javascript numbers method
let num = 1.23456;
console.log(num.toFixed(3)); // 1.235
ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”
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ะ—ะดะตััŒ, toFixed(n) ะพะบั€ัƒะณะปัะตั‚ ั‡ะธัะปะพ ะดะพ ะพะฟั€ะตะดะตะปะตะฝะฝะพะน ั‚ะพั‡ะฝะพัั‚ะธ.

ะะฐะฟั€ะธะผะตั€:

Javascript numbers methods
let num = 1.23456;
console.log(num.toFixed(2)); // 1.23
ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”
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ะžะฑั€ะฐั‚ะธั‚ะต ะฒะฝะธะผะฐะฝะธะต, ั‡ั‚ะพ ะฒั‹ ะผะพะถะตั‚ะต ะธัะฟะพะปัŒะทะพะฒะฐั‚ัŒ ะบะพะฝัั‚ั€ัƒะบั‚ะพั€ั‹ String/Number/Boolean ั‚ะพะปัŒะบะพ ะฒะฝัƒั‚ั€ะตะฝะฝะต.

ะ’ ะฝะตะบะพั‚ะพั€ั‹ั… ะดั€ัƒะณะธั… ัะทั‹ะบะฐั…, ะฝะฐะฟั€ะธะผะตั€, ะฒ Java, ะฟั€ะตะดะพัั‚ะฐะฒะปััŽั‚ัั ะฒะพะทะผะพะถะฝะพัั‚ะธ ัะพะทะดะฐะฒะฐั‚ัŒ ยซะพะฑัŠะตะบั‚ั‹-ะพะฑะตั€ั‚ะบะธยป ะดะปั ะฟั€ะธะผะธั‚ะธะฒะพะฒ ั ะฟะพะผะพั‰ัŒัŽ ัะปะตะดัƒัŽั‰ะตะณะพ ัะธะฝั‚ะฐะบัะธัะฐ:

new Number(1);
or
new Boolean(false);

ะขะตะพั€ะตั‚ะธั‡ะตัะบะธ, ัั‚ะพ ะฒะพะทะผะพะถะฝะพ ะธ ะฒ JavaScript, ะฝะพ ะผั‹ ะฝะต ั€ะตะบะพะผะตะฝะดัƒะตะผ ะฒะฐะผ ัั‚ะพ ะดะตะปะฐั‚ัŒ. ะญั‚ะพ ะผะพะถะตั‚ ะฟั€ะธะฒะตัั‚ะธ ะบ ะฝะตะถะตะปะฐั‚ะตะปัŒะฝั‹ะผ ั€ะตะทัƒะปัŒั‚ะฐั‚ะฐะผ. ะะฐะฟั€ะธะผะตั€:

Javascript numbers methods
console.log(typeof 0); // "number"
console.log(typeof new Number(0)); // "object"
ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”
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ะ’ if, ะพะฑัŠะตะบั‚ั‹ ะฒัะตะณะดะฐ ะธัั‚ะธะฝะฝั‹ะต. ะ—ะดะตััŒ ะฟั€ะตะดัƒะฟั€ะตะถะดะตะฝะธะต ะฟะพะบะฐะถะตั‚ ัะปะตะดัƒัŽั‰ะตะต:

Javascript numbers methods
let zero = new Number(0);
if (zero) { // zero is true, because it's an object
console.log("In this case, zero is truthy!");
}
ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”
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ะ•ั‰ะต ะพะดะฝะฐ ะฟะพะปะตะทะฝะฐั ะฒะตั‰ัŒ - ะธัะฟะพะปัŒะทะพะฒะฐะฝะธะต ั‚ะตั… ะถะต ั„ัƒะฝะบั†ะธะน String/Number/Booleanะฑะตะท new. ะก ะธั… ะฟะพะผะพั‰ัŒัŽ ะทะฝะฐั‡ะตะฝะธะต ะฟั€ะตะพะฑั€ะฐะทัƒะตั‚ัั ะฒ ัั‚ั€ะพะบัƒ, ั‡ะธัะปะพ ะธ ะปะพะณะธั‡ะตัะบะพะต ะทะฝะฐั‡ะตะฝะธะต.

ะ’ะพั‚ ะฟั€ะธะผะตั€:

Javascript numbers methods
let num = Number("12"); // convert a string to number
console.log(typeof num);
ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”ื”
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ะ ะตะทัŽะผะต

ะŸั€ะธ ะฟั€ะธะผะธั‚ะธะฒะต ะตัั‚ัŒ ะผะฝะพะถะตัั‚ะฒะพ ะฟะพะปะตะทะฝั‹ั… ะผะตั‚ะพะดะพะฒ (ะทะฐ ะธัะบะปัŽั‡ะตะฝะธะตะผ null ะธ undefined). ะญั‚ะธ ะผะตั‚ะพะดั‹ ั„ัƒะฝะบั†ะธะพะฝะธั€ัƒัŽั‚ ั‡ะตั€ะตะท ะฒั€ะตะผะตะฝะฝั‹ะต ะพะฑัŠะตะบั‚ั‹. ะ”ะฒะธะถะบะธ JavaScript ะฟั€ะฐะฒะธะปัŒะฝะพ ะฝะฐัั‚ั€ะพะตะฝั‹ ะดะปั ัƒัะบะพั€ะตะฝะธั ัั‚ะพะณะพ ะฒะฝัƒั‚ั€ะตะฝะฝะต. ะŸะพัั‚ะพะผัƒ ะฒั‹ะทะพะฒ ะธั… ะฝะต ัะฒะปัะตั‚ัั ะทะฐั‚ั€ะฐั‚ะฝั‹ะผ.

ะ’ั€ะตะผั ะ’ะธะบั‚ะพั€ะธะฝั‹: ะŸั€ะพะฒะตั€ัŒั‚ะต ะกะฒะพะธ ะะฐะฒั‹ะบะธ!

ะพั‚ะพะฒั‹ ะฟั€ะพะฒะตั€ะธั‚ัŒ ัะฒะพะธ ะทะฝะฐะฝะธั? ะŸะพะณั€ัƒะทะธั‚ะตััŒ ะฒ ะฝะฐัˆะธ ะธะฝั‚ะตั€ะฐะบั‚ะธะฒะฝั‹ะต ะฒะธะบั‚ะพั€ะธะฝั‹ ะดะปั ะฑะพะปะตะต ะณะปัƒะฑะพะบะพะณะพ ะฟะพะฝะธะผะฐะฝะธั ะธ ะฒะตัะตะปะพะณะพ ัะฟะพัะพะฑะฐ ะทะฐะบั€ะตะฟะธั‚ัŒ ะทะฝะฐะฝะธั.

ะกั‡ะธั‚ะฐะตั‚ะต ะปะธ ัั‚ะพ ะฟะพะปะตะทะฝั‹ะผ?