JavaScript

 

JavaScript Array Methods

Array length

*The length property returns the length (size) of an array.

example:

var a = [ "welcome" ];

console.log(  a . length )

output : 1

var a =[ "welcome", "you"]

console.log( a. length)

output : 2

var a = [ "welcome", "you", "all"]

console.log(  a . length );

output : 3

var a = [" array to a string " ]

console.log(  a . length );

output : 3

Array toString()

what is Array toString() ?

• The JavaScript method toString() converts an array to a string of (comma separated)  array values.

• The elements are then joined together into a single string, with each element separated by a comma.

example:

var array = ["welcome", "you", "all"]

console.log ( array.toString())

output:

welcome,you,all

var a = [ "red ", "yellow","green"]

console.log( a .toString())

output :

 red,yellow, green

var b = [ "onedrive ","mouse", "desktop"]

console.log( b. toString());

output :

onedrive ,mouse, desktop

JavaScript Array at()

• The at() method returns an indexed element from an array. The at() method returns the same as [] .

example:

var array = ["welcome", "you", "all"]

console.log ( array.at())

console.log(' ');

var a = [ "red ", "yellow","green"]

console.log( a .at(1))

console.log(' ');

var b = [ "onedrive ","mouse", "desktop"]

console.log( b. at(2));

console.log(' ');

var b = [ "onedrive ","mouse", "desktop"]

console.log( b. at(-1));

console.log(' '); ||| get last element in array at

JavaScrpit join()

• The join() method also joins all array elements into a string.
• It behaves just like toString(), but in addition you can specify the separator:

var array = ["welcome", "you", "all"]

console.log ( array.join('!'))

console.log ( array.join('@'))

console.log ( array.join('$'))

console.log ( array.join('^'))

console.log ( array.join('&'))

console.log ( array.join('*'))

console.log ( array.join(' '))

console.log ( array.join(' '))

console.log ( array.join(' '))

console.log ( array.join('+'))

output:

welcome!you!all

welcome@you@all

welcome$you$all

welcome^you^all

welcome&you&all

welcome*you*all

welcome you all

welcome you all

welcome you all

welcome+you+all