This is a draft cheat sheet. It is a work in progress and is not finished yet.
Data types
strings |
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numbers |
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booleans |
true | false | 5 > 3 (true)
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arrays |
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Comparison operators
> |
Greater than |
< |
Less than |
<= |
Less or equal |
>= |
Greater or equal |
=== |
Equal to |
!== |
Not equal to |
Operators
a = a + 1 |
a++ |
a = a - 1 |
a-- |
a = a + b |
a += b |
a = a - b |
a -= b |
a = a * b |
a *= b |
a = a / b |
a /= b |
a = a % b |
a %= b |
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String Properties and Methods
.length |
Return the number of characters in a string |
.substring() |
Extract characters from a string, var str = "Hello world!";
var res = str.substring(1, 4);
-> ell
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If else
if (condition1) {
// code
} else if (condition2) {
// code
} else {
// code
}
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Functions
var doStuff = function (par1, par2) {
value = par1 + par2;
print value;
}
countSomeStuff(par1,par2);
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FOR loop
for (var i = 1; i < 11; i = i + 1) {
// code
}
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While
var x = true;
while ( x === true) {
// code
x = false // to stop loop
}
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Case Switch
switch ( x ) {
case 'option1':
// code
break;
case 'option2':
// code
break;
case 'option3':
// code
break;
default:
// code
}
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Objects
var myObject = {
key: value,
};
var emptyObj = {};
var myObj = new Object();
myObj.name = "Tom";
loop over the keys of an object:
for (var x in object) {
// code
}
Create class for ogject:
function Cat(name, breed) {
this.name = name;
this.breed = breed;
}
var cheshire = new Cat("Cheshire Cat", "British Shorthair");
if you want to add a method to a class such that all members of the class can use it, we use the following syntax to extend the prototype:
className.prototype.newMethod =
function() {
// code
};
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