- Categories: JavaScript Properties, JavaScript Reference, Reference
Quick Reference
The Class extends keyword is used to create a child class of a parent class, which then inherits all the methods from the parent class.
<!-- html element to place output -->
<p id="my_output"></p>
// class
class car {
constructor(brand) {
this.car_name = brand;
}
present() {
return 'I have a ' + this.car_name;
}
}
class model extends car {
constructor(brand, mod) {
super(brand);
this.model = mod;
}
show() {
return this.present() + '. It is a ' + this.model + '.';
}
}
// add to the class
my_car = new model('Maserati', 'Ghibli');
// output to HTML element
document.getElementById('my_output').innerHTML = my_car.show();
Output
I have a Maserati. It is a Ghibli.
Syntax
class childClass extends parentClass
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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