What do these functions do?

01.js

function whatDoesItDo(val){

    return val ? 1 : 2;

}

02.js

function whatDoesItDo(param){

    return { blue:"#0000ff", green:"#00ff00", red:"#ff0000" }[param];

}

03.js

function whatDoesItDo(color){

    if (color !== 'blue' || color !== 'green') {
        color = 'red';
    }
	
    return color;
}

04.js

function whatDoesItDo(arr){

    return arr.filter(function(elem, pos) {
        return arr.indexOf(elem) == pos;
    });

};

05.js

function whatDoesItDo(arr){
    
    return arr.reduce(function(s, n){ return s + n; }, 0);

}

06.js

function whatDoesItDo(arr){
    
    return arr.map( function(x){ return x*2; });

}

07.js

function whatDoesItDo(mood){
    
    return mood && "I like this" || "I don't like this";

}

08.js

function whatDoesItDo(str){
    
    return str.split('').reverse().join('')

}

09.js

function whatDoesItDo(){

    return document.querySelectorAll('*').length;

}

10.js

function whatDoesItDo(arr){

    return Math.max.apply(null, arr);

}

11.js

function whatDoesItDo(arr){

    return arr.slice(0).sort();

}

12.js

function whatDoesItDo(num){

    return Math.max(0, Math.min(10, num));

}

13.js

function whatDoesItDo(){

    var values = [];
    
    myBlock: {
        values.push('1');
        values.push('2');
        break myBlock;
        values.push('3');
    }
    
    values.push('4');
    
    return values.join(',');
}

14.js

function whatDoesItDo(){

    return Array(4).join("lol" - 2) + " Batman!";

}

15.js

function whatDoesItDo(str){

    return str.bold().italics();

}

16.js

function whatDoesItDo(str){

    return /^\d{3,}$/.test(str);

}

17.js

function whatDoesItDo(num){

    return this + num;

}

whatDoesItDo = whatDoesItDo.bind(10);

18.js

function whatDoesItDo(){

    return (![]+[])[+[]]+(![]+[])[+!+[]]+
           ([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]];

}

15 has been depreciated (bold() and italics())

Would be great to follow up the quiz with an explanation of some of these.
Thanks

Great hints for Javascript. Please provide some for operations on array of objects such as sorting, filtering

do you have an explanation for the 18th? what do you call that in english ? :)

head to jsfuck
it returns "fail"