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let user = {
name: "John",
age: 30,
sayHi() {
alert(user.name); // "user" instead of "this"
}
};Forwarded from coding with ☕️
function BigUser() {
this.name = "John";
return { name: "Godzilla" }; // <-- returns this object
}
alert( new BigUser().name ); // Godzilla, got that objectForwarded from coding with ☕️
function BigUser(){
this.name = "Fotima"
return {name: "Godzila"};
}
alert(new BigUser().name );
console.log(new BigUser())Forwarded from coding with ☕️
`
with "New Operator" we can call in "console.log" with " ( ) "Forwarded from coding with ☕️
function BigUser(){
this.name = "Fotima"
return {name: "Godzila"};
}
alert(new BigUser().name );
console.log(new BigUser().name)Forwarded from coding with ☕️
let id = Symbol("id");
alert(id.description);
console.log(Symbol())Forwarded from coding with ☕️
JavaScriptda primitive (oddiy) turlar bu oddiy qiymatlar bo‘lib, ular obyekt emas, o‘zgaruvchining o‘zida saqlanadi va o‘zgarmas (immutable) bo‘ladi.
JavaScriptdagi primitive turlar:
String – "hello", 'world'
Number – 42, 3.14, -10
Boolean – true, false
Undefined – let x; (qiymati yo‘q)
Null – let y = null; (bo‘sh qiymat)
Symbol – Symbol("id") (noyob identifikator)
BigInt – 12345678901234567890n (katta sonlar uchun)
JavaScriptdagi primitive turlar:
String – "hello", 'world'
Number – 42, 3.14, -10
Boolean – true, false
Undefined – let x; (qiymati yo‘q)
Null – let y = null; (bo‘sh qiymat)
Symbol – Symbol("id") (noyob identifikator)
BigInt – 12345678901234567890n (katta sonlar uchun)
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A primitive
Is a value of a primitive type.
There are 7 primitive types: string, number, bigint, boolean, symbol, null and undefined.
An object
Is capable of storing multiple values as properties.
Can be created with {}, for instance:
There are other kinds of objects in JavaScript: functions, for example, are objects.
Is a value of a primitive type.
There are 7 primitive types: string, number, bigint, boolean, symbol, null and undefined.
An object
Is capable of storing multiple values as properties.
Can be created with {}, for instance:
{name: "John", age: 30}.There are other kinds of objects in JavaScript: functions, for example, are objects.
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let john = {
name: "John",
sayHi: function() {
alert("Hi buddy!");
}
};
john.sayHi(); // Hi buddy!
One of the best things about objects is that we can store a function as one of its properties.Forwarded from coding with ☕️
Common binary operators:
Arithmetic: +, -, *, /, %
Assignment: =, +=, -=, *=, /=
Comparison: ==, !=, ===, !==, >, <, >=, <=
Logical: &&, ||
Bitwise: &, |, ^, <<, >>, >>>
Ternary: condition ? expr1 : expr2 (Special case, but still binary because of two expressions)
Arithmetic: +, -, *, /, %
Assignment: =, +=, -=, *=, /=
Comparison: ==, !=, ===, !==, >, <, >=, <=
Logical: &&, ||
Bitwise: &, |, ^, <<, >>, >>>
Ternary: condition ? expr1 : expr2 (Special case, but still binary because of two expressions)
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Common unary operators:
+ (Unary plus, converts to number)
- (Unary negation, negates a number)
! (Logical NOT)
typeof (Returns type of a variable)
delete (Deletes object properties)
void (Evaluates an expression but returns undefined)
++ (Increment)
-- (Decrement)
+ (Unary plus, converts to number)
- (Unary negation, negates a number)
! (Logical NOT)
typeof (Returns type of a variable)
delete (Deletes object properties)
void (Evaluates an expression but returns undefined)
++ (Increment)
-- (Decrement)
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let num = Number("123"); // convert a string to numberForwarded from coding with ☕️
const arr = ["Coding", "With", "Even"];
arr.pop();
console.log(arr)
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const arr = ["Coding", "With",];
arr.push("Even");
console.log(arr)
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let set = new Set();
let john = { name: "John" };
let pete = { name: "Pete" };
let mary = { name: "Mary" };
// visits, some users come multiple times
set.add(john);
set.add(pete);
set.add(mary);
set.add(john);
set.add(mary);
// set keeps only unique values
alert( set.size ); // 3
for (let user of set) {
alert(user.name); // John (then Pete and Mary)
}
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let user = {
name: "John",
age: 30,
toString() {
return `{name: "${this.name}", age: ${this.age}}`;
}
};
alert(user); // {name: "John", age: 30}