JavaScript syntax
part 33/59 · 107.4 KB total
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let x = 9;
x += 1;
console.log(x); // displays: 10
x *= 30;
console.log(x); // displays: 300
x /= 6;
console.log(x); // displays: 50
x -= 3;
console.log(x); // displays: 47
x %= 7;
console.log(x); // displays: 5
Assignment of object types
/**
* To learn JavaScript objects...
*/
const object_1 = {a: 1}; // assign reference of newly created object to object_1
let object_2 = {a: 0};
let object_3 = object_2; // object_3 references the same object as object_2 does
object_3.a = 2;
message(); // displays 1 2 2
object_2 = object_1; // object_2 now references the same object as object_1
// object_3 still references what object_2 referenced before
message(); // displays 1 1 2
object_2.a = 7; // modifies object_1
message(); // displays 7 7 2
object_3.a = 5; // object_3 does not change object_2
message(); // displays 7 7 5
object_3 = object_2;
object_3.a=4; // object_3 changes object_1 and object_2
message(); // displays 4 4 4
/**
* Prints the console.log message
*/
function message() {
console.log(object_1.a + " " + object_2.a + " " + object_3.a);
}
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