JavaScript Methods #

Specific methods.

Getters #

Get and return properties of objects.

Use the get keyword within an object, followed by a method.

const someObj = {
    ...;
    get someMethod() {
        ...;
    }
}

To access a getter, don’t use parenthesis. It’ll look like acceessing a property.

console.log(someObj.someMethod);

Math #

For more details

.floor() #

Rounds down to whole number

console.log(Math.floor(Math.random())) // a little bit of encapsulation

.random() #

get a random number between 0 and 1:

console.log(Math.random())

Setters #

Related to getters. Reassigns values of existing properties within objects.

const someObj = {
    _someValue = ...;
    set newValue(new_value) {
        if (typeof new_value == 'string') {
            this._someValue = new_value;
        } else {
            console.log('blah blah nothing changes');
        }
    }
}

// invoke with the following
someObj.newValue = 'a new string!';

console.log(someObj._someValue); // this should now log `a new string!`

^ like getters, invocation doesn’t require parenthesis.

Note: name of getter and setter method can be the same. Depending on invocation, it can get or set.

Strings #

• .trim()

• .toUpperCase()

Built-in #

Bunch built-in methods available to all objects.

Get keys #

Object.keys(someObject);