JS built-in objects

JS has built-in 17 objects, commonly used is the array object, Date object, regular Expression object, string object, global object, that is, JS has been created, you do not have to create their own objects, can be called directly.

object is the parent object of all objects in JavaScript
Data encapsulation Class object: Object, Array, Boolean, number, and String
Other objects: Function, Arguments, Math, Date, REGEXP, Error

Array Object
Concat (): Represents the merging of several arrays into an array.
Join (): Returns a string value that contains all the elements of an array joined together, separated by the specified delimiter.
Pop (): Removes the last element of the divisor group.
Shift (): Removes the first element in an array.
Slice (Start,end): Returns a paragraph in the array.
Push (): Adds a new element to the array, returning the latest length.
Sort (): Sorts the array.
Reverse (): Reverses the ordering of the array.
toLocaleString (); Returns the current system time
Array object properties are commonly used for only one:
Length: Indicates the current array size is obtained

Global Object
is an intrinsic object that concentrates all global methods in one object.
Global has no syntax and calls its methods directly.
Escape (): Encodes a String object so that they can be read on all computers.
Escape (charstring)
Required option The Charstring parameter is any String object or literal that you want to encode.
IsNaN (): Determines whether a value is Nan.
parseint (): Returns the integer that is obtained by the string

Regular Expression Object
This object contains the regular expression pattern and flags that indicate how the pattern is applied.
Syntax 1
Re =/pattern/[flags]
Syntax 2
Re = new RegExp ("pattern", ["flags"])
Re is the name of the variable that will be assigned the regular expression pattern
Pattern is a regular expression
Flags as marked: There are 3 of the following
1:g (full-text search)
2:I (ignoring case)
3:M (multi-line lookup)
Syntax 1 is used when finding a string in advance. Use Syntax 2 when finding a string that is constantly changing or not known, such as a string that is obtained by user input.

String Object
CharAt (): Character that returns the position of the specified index
Concat (): Returns a String value representing the connection of two or more strings
Match (): uses the regular expression pattern to perform a lookup on a string and returns the most results that contain the lookup results
function Matchdemo () {
var r, re;//declares the variable.
var s = "The rain in Spain falls mainly in the plain";
Re =/ain/i;//creates the regular expression pattern.
r = S.match (re);//try to match the search string.
return (R);//returns to the place where "ain" first appears.
}
Replace (b): Character B replaces a
Search (Stringobject): Indicates whether there is a corresponding match. If a match is found, the search method returns an integer value indicating the offset from the beginning of the match distance string. If no match is found, 1 is returned.
Slice (start,end): Return segment Fragment
Split (): String split
Substr (start,length): String intercept
Substring (Start,end) Gets the string within the specified length
toUpperCase (): Returns a string in which all letters in the string are converted to uppercase letters.
toLowerCase (): Returns a string that all letters in the string are converted to lowercase letters.

JS built-in objects