This document contains code snippets demonstrating JavaScript fundamentals like variables, data types, operators, conditional statements, functions, objects and more. It appears to be teaching material or examples for learning JavaScript syntax and concepts.

2. 2

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var iable = 'hello world';
iable = 5;
global_var = 'hello world';
let knowledge = '';
47 + 11;
'47' + '11';
47 + '11';
47 + Number('11');

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var
let var

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4 * 10 + 2;
4 * (10 + 2);
var i = 3;
iable += i++;
iable = ++i;

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var tru = 1, fals = 0, wtf = 2;
tru || fals;
wtf || fals;
wtf || tru;
tru || wtf;
var tru = 1, fals = 0, wtf = 2;
tru && fals;
wtf && fals;
wtf && tru;
tru && wtf;

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true
false

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'any string';
[];
{ };
1;
'';
NaN;
null;
undefined;

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var one = 1, two = 2,
two_in_words = '2';
one == two;
one != two;
two == two_in_words;
two === two_in_words;
two < one;
two >= two_in_words;

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if (one) console.log('hello noob!') else console.log('wtf');
console.log(true ? 'hello noob!' : 'wtf');
var mind_twist = 'happens' && 'is annoying' ? 'with strange statements' && 'is real terror'
: 'even if your skill' > 9000 || 'you work alone';
mind_twist == "is real terror" ? console.log("hello pro!") : 'wtf';

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if else if else
if else

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switch (something) {
case 'really interesting':
alert('wow this case is really interesting!');
break;
case 42:
alert('ok makes sense');
break;
default:
alert('no specific case was evaluated -> default');
break;
}

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for(var i = 0; i <= 9000; i++) console.log('power level ' + i );
var go_on = true;
while( go_on ) if( Math.random()*6 >= 5 ) go_on = false;
do { // interesting thing
still_interesting ? continue : break;
} while ( i++ < 100 );

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for while do
do
while

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var Story = ['this', 'is', 'a story', 'all about', 'how my code', 'got', 'flipped turned
upside down'];
Story[2] + Story[5] + Story[6]; a
var Story2 = [];
Story2.push(Story[0], Story[1], Story[4], Story[5], Story[2]);
console.log(Story2 = Story2.join(' '));
console.log(Story2.split(' '));
Story2.length;

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split join

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var myObject = {
sayHello : function() { console.log('hello'); },
myName : ‘gfnork'
};
myObject.sayHello();
console.log(myObject.myName);

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myObject.sayName = function () {
console.log('my name is: ' + this.myName);
};
myObject.sayName();
var testObj = { sayName: myObject.sayName };
testObj.sayName();

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this
this
this
this
this this

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var TalkTo = function(person, msg) {
var text = msg + ', ' + person;
console.log(text);
};
TalkTo('Gfnork', 'What’s up');
var TextTo = function(person, msg) {
return = msg + ', ' + person;
};

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var insult = function () { console.log('idiot!') };
var praise = function () { console.log('good boy!') };
var teacher = function () {
if (Math.random() < 0.5) return insult();
else return praise();
};
teacher();
teacher();

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(function () {
console.log('This output will be printed once!');
})();
var teacher = function () {
var reaction = Math.random() < 0.5 ?
function () { console.log('idiot!') }() :
function () { console.log('good boy!') }();
return reaction;
};

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