JavaScript Commands

If - Else

If (true) { 
    Status = true; 
} else [ 
    Status = false;

Switch statement:

var num = <input>
Switch (num) { 
case O:
    document.write("zero");
case 1: 
    document.write("one");
default: 
    document.write("welp");

Variables

var a;            //variable
b = "init";       //string
varc 8;           //int
var d false;      //Boolean
var e[1,2,3,4,5]; //array
const PI = 3.14;  //constant

Functions

Function addNumbers(a,b) {
    return a + b;
}
X = addNumbers(1,2);

Loops

For loop:

for (var i —O; i < 10; i++) { 
    document.write("this will happen 10 times");
}

While loop:

var i = 1;
while(i < 100) {
    i*=2; 
    document.write(i);
}

Do while loop:

var i = 1;
do {
    i*=1;
    document.write(i); 
} While (i < 100);

Operators

A= b + c - d;    //Add, subtract 
A = b * (c / d); //multiply, divide 
X = 100 % 48;    // modulo, 100 / 48 remainder = 4
a++; b--;        //postfix increment/decrement

Other

a = b   //assignment 
a == b  //equals 
a != b  //not-equal 
a === b //strict equals 
a < b, a > b, a =< b, a => b //less/greater 
a && b  //logical and 
a || b  //logical or