Common functions in JavaScript (entry level) (continuous update)

Maple Bamboo Dream In this article introduces some of the most commonly used functions of the entry level in JavaScript, and it is a very useful function for children's shoes that have gone through the introduction. If you find any problem, please discuss it.

List of issues

Q1:

Design a function repeatIt(str, n) , enter a string str and an integer n, return a string consisting of n str, and return "not a stirng" if Str is not a string. For example, repeatIt("furzoom", 2) "Furzoomfurzoom" is returned. Go to A1.

Q2:

Design a function digitChar(n) , enter a non-negative integer n, and return an array containing the number of integer n from low to high. For example, digitChar(123) returns [3, 2, 1]. Go to A2.

Q3:

Design a function nameSwap(name) , enter the name, the first and last names are separated by a space, the first and last names are exchanged and returned, still separated by a space. For example, nameSwap("Ma Yan") return "Yan Ma". Go to A3.

Problem solving

A1:

function Repeatit (str, n) {  return typeof str = = = = = "string"? Array (n + 1). Join (STR): "Not a string";}

Go to Q1.

A2:

function Digitchar (n) {  return (n + "). Split ("). Map (number). reverse ();

Go to Q2.

A3:

function Nameswap (name) {  return Name.split ("). Reverse (). Join (');}

Go to Q3.

Common functions in JavaScript (entry level) (continuous update)