Table of Contents
Value Types
- Number Any numeric value.
- String Characters inside quote marks.
- Boolean True or False.
- Null Empty and meaningless.
- Object Any value associated with the object.
- Function Value returned by a function.
Operators
- x+y (numeric) Adds x and y together.
- x+y (string) Concatinates x and y together.
- x-y Subtracts y from x.
- x*y Multiplies x and y together.
- x/y Divides x by y.
- x%y Modulus: The remainder when x is divided y.
- x++,++x Adds one to x.
- x--,--x Subsctract one from x.
- -x Reverses the sign on x.
Assignments
- x=y Sets x to the value of y.
- x+=y Same as x = x + y.
- x-=y Same as x = x - y.
- x*=y Same as x = y.
- x/=y Same as x = x / y.
- x%=y Same as x = x % y.
Adding to an Array
- .length Adds one value to the end of an array.
- push() Adds one or more items to the end of an array.
- unshift() Adds one or more items to the beginning of an array.
Misc
- parseInt() Takes a value and tries to convert it to an integer.
- isNaN() Returns true if something is not a number.
- setTimeout() Specify that an action should occur on a particular schedule.
- Math.floor Rounds a number down.
- Math.random Generates a random number between 0 and 1.
- getElementByTagName()
- getElementById()
- getElementByClassName()
- element.innterHTM returns all the HTML between the opening and closing tags.
- element.nodeType property, returns the number of the node type.
Event Handlers
- onabort The aborted user loading the page.
- onblur The user left the object.
- onchange The user changed the object.
- onclick The user clicks an object.
- onerror The script encountered an error.
- onfocus The user made an object active.
- onload The object finished loading.
- onmouseover The cursor moved over an object.
- onmouseout The cursor moved off an object.
- onselect The user selects the contents of an object.
- onsubmit The user submitted a form.
- onunload The user left the page.
- onmove The window is moved.
- ondblclick A double click of a mouse button.
- onclick A single click (down and then up) of a mouse button.
- onreset A reset button is clicked on a form.
- onkeydown Triggered when a key is pressed down.
- onkeyup Triggered when a key is released.
- onkeypress Triggered when a key is pressed and then released.
Comparisons
- x==y Returns true if x and y are equal.
- x===y Returns true if x and y are identical.
- x!=y Returns true if x and y are not equal.
- x!==y Returns true if x and y are not identical.
- x>y Returns true if x is greater than y.
- x>=y Returns true if x is greater than or equal to y.
- x<y Returns true if x is less than y.
- x<=y RetJrns true if x is less than or equal to y.
- x&&y Returns true if both x and y are true.
- x||y Returns true if either x or y is true.
- !x RetJrns true if x is false.
Remove Item From an Array
- pop() Removes the last item from the array.
- shift() Removes the first item from the array.
📝📝 Again this is not a complete JavaScript overview, this is just a small cheat sheet from where you can take help for clearing concepts.
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