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‎JAVA SCRIPT/DEGISKENLER/DEGISKEN TANIMLAMA/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Modern Java Script</title>
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</head>
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<body>
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<h1>Modern Javascript Kursu: Sifirdan Ileri Seviyeye</h1>
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<script src="script.js" type="text/Javascript"></script>
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</body>
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</html>

‎JAVA SCRIPT/DEGISKENLER/DEGISKEN TANIMLAMA/script.js‎

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// var age;
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// age= 20;
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// console.log(age);
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// var fullname='Mustafa Özdemir';
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// console.log(fullname);
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// fullname='Elif Özdemir';
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// console.log(fullname);
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// var ad='Mustafa ';
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// var soyad='Özdemir';
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// // degiskenler sayi ile BASLAMAZ
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// var yas1;
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// var _yas2;
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// var $yas3;
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// //komut isimleryle tanimlama yapilamaz.
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// // birden fazla kelimeyi ayrik yazarak
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// var ad= 'mustafa';
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// var soyad='özdemir';
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// var AdSoyad= 'Mustafa Özdemir';
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// // case sensitiv (büyük kücük harf Duyarliligi)
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// var FirstName='Mustafa ';
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// var firstName=' Mustafa';
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// console.log(FirstName);
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// console.log(firstName);
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// // var , let , const
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// let city='Sinop';
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// console.log(city);
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// const email='abc@gmail.com';
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// console.log(email);
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// email='dcg@gmail.com';
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// // const sonra degismesini istemedigimiz degiskenleri tanimliyoruz.
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// Ders 3:
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//string
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let firstName = 'Mustafa';
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console.log(typeof firstName);
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//number
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let age = 20;
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console.log(typeof age);
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let money=100.5;
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console.log(typeof money)
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// Boolean
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let isActive = false;
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console.log(typeof isActive);
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// null
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let job=null;
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console.log(typeof job);
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// null degiskeni herhangi bir atama yapilamadigi anlaminina geliyor.
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// undefined
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let car;
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console.log(typeof car)
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// herhangi bir deger atanmadi.
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// Reference Types - Objects
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// Array
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let names=['Ai', 'Can', 'Ahmet'];
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console.log(typeof names);
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// Objects
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let address = {
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city:'Kocaeli',
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country:'Türkiye'
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};
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console.log(typeof address);
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//function
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var calculateAge= function(){
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return 0;
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};
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console.log(typeof calculateAge);

‎JAVA SCRIPT/DEGISKENLER/DEGISKENLER UYGULAMA/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Modern Java Script</title>
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</head>
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<body>
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<h1>Modern Javascript Kursu: Sifirdan Ileri Seviyeye</h1>
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<script src="script.js" type="text/Javascript"></script>
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</body>
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</html>

‎JAVA SCRIPT/DEGISKENLER/DEGISKENLER UYGULAMA/script.js‎

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var customerName = "Mustafa";
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var customerLastName = "Özdemir";
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var fullName = "Mustafa Özdemir";
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let customerId = 12345436785;
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var total = 205.6;
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var gender = true // var gender = "man" erkek icin kullanilabilir.
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var address = " Sinop Dikmen"
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// ya da
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//object
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var address1 = {
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city: Sinop,
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district: Dikmen,
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street: Canakci,
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}
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//array
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var hobbies = ["cinema", "Book", "Spor"];
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var order1 = Number('100.2');
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var order2 = Number('150.5');
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var totalOrder = order1 + order2;
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console.log(totalOrder);
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// Asagidaki sayilari tam sayi olarak hesaplayiniz
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var order3 = Number('100.2');
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var order4 = Number('150.5');
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var totalOrder1 = parseInt(order3 + order4);
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console.log(totalOrder1);

‎JAVA SCRIPT/DEGISKENLER/TÜR DÖNÜSÜMÜ/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Modern Java Script</title>
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</head>
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<body>
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<h1>Modern Javascript Kursu: Sifirdan Ileri Seviyeye</h1>
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<script src="script.js" type="text/Javascript"></script>
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</body>
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</html>

‎JAVA SCRIPT/DEGISKENLER/TÜR DÖNÜSÜMÜ/script.js‎

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// Ders 4 :Tür Dönüsümü
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let num1='5';
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let num2='10';
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console.log(num1+num2)
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// bu iki string sayiyi birlestirir 510 degeri olusur.
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//EGER asagidaki gibi yazarsak
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let num11= Number('5');
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let num22= Number('10');
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console.log(num11+num22);
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console.log(typeof num1);
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let total= num11+num22;
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console.log(typeof total)
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// sonuc ise 15 tipi de number
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// stringe cevirme
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let val;
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val= String(true);
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console.log(val);
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console.log(typeof val);
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console.log(val.length)
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// new Date() object türü degisken;
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// date to string
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val = String(new Date());
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console.log(val);
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console.log(typeof val);
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console.log(val.length);
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// object türünü stringe cevirdik
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//array to string
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val = String([1,3,4,5 ]);
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console.log(val);
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console.log(typeof val);
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console.log(val.length);
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//toString()
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val = (10).toString;
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console.log(val);
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console.log(typeof val);
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console.log(val.length);
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val = (false).toString;
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console.log(val);
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console.log(typeof val);
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console.log(val.length);
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// String to Number
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val = Number('10');
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console.log(val);
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console.log(typeof val);
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console.log(val.length);
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// .length string degerlerin uzunlugu bulur
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// boolen to number
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val = Number(true);
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console.log(val);
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console.log(typeof val);
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console.log(val.length);
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// console degeri 1
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val = Number(false);
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console.log(val);
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console.log(typeof val);
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console.log(val.toFixed(2));
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// console degeri 0
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val = Number(null);
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console.log(val);
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console.log(typeof val);
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console.log(val.length);
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// console degeri 0
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//parseInt
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//parseFloat
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val = parseInt('10')
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console.log(val);
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console.log(typeof val);
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val = parseFloat('10.3')
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console.log(val);
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console.log(typeof val);
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