console.log("JavaScript is linked");



function init() {
    sayHello();
    //defTitre1();
    //defTitre2();
    //defTitre3();    
    defTitre4();

}

function sayHello() {
    console.log("Hello Everypony !");
}

function defTitre1() {
    if (document.title = document.getElementById("titre").innerText) {
        console.log("<title> set : Ok Everypony !");
    }
}

function defTitre2() {
    var firstH2 = document.getElementsByTagName("h2");
    if (firstH2 != null) {
        document.title = firstH2[0].innerText;
        console.log("<title> set : Ok Everypony !");

    }
}

function defTitre3() {
    var lastH2 = document.getElementsByTagName("h2");
    if (lastH2 != null) {
        document.title = lastH2[lastH2.length - 1].innerText;
        console.log("<title> set : Ok Everypony !");

    } else {
        document.title = "Page par Pauline Célestiale";
        console.warn("There is no H2 tag on this page Everypony ! /:")
    }
}

function defTitre4() {
    var choosenH = document.getElementsByClassName("firstOrLast");
    if (choosenH != null) {
        if (choosenH.length % 2 == 0) {
            document.title = choosenH[0].innerText;
            console.log("<title> set first H : Ok Everypony !");
        } else {
            document.title = choosenH[choosenH.length - 1].innerText;
            console.log("<title> set last H : Ok Everypony !");
        }
    } else {
        document.title = "Page par Pauline Célestiale";
        console.warn("There is no H2 tag on this page Everypony ! /:")
    }
}

function invertText() {
    var buffer;
    var un = document.getElementById("1");
    var deux = document.getElementById("2");

    buffer = un.innerText;
    un.innerText = deux.innerText;
    deux.innerText = buffer;

}