JavaScript notes (ii)--application of common arrays and string methods

1. Flip the characters in the string, such as ' Hello ', and flip it into ' Olleh '.

var arr=[];

function ReverseString (str) {
Arr=str.split ("");

Arr=arr.reverse ();

Str=arr.join ("");
return str;
}

ReverseString ("Hello");

2. Calculate the factorial of an integer

function factorialize (num) {
if (num<=1) {
return 1;
}
else if (num>0) {
Return Factorialize (num-1) *num;
}

return num;
}

Factorialize (5);

3. Detects if a string is a palindrome number, or returns TRUE.

A palindrome is a word or sentence that has been read backwards and forwards, with the exception of punctuation marks and spaces, and special symbols.

var arr=[];
var str1= "";

function Palindrome (str) {

Str=str.replace (/[^0-9a-za-z]/g,function () {
Return "";
});
Str=str.tolowercase ();

Arr=str.split ("");
Arr=arr.reverse ();

Str1=arr.join ("");

if (STR1===STR) {
return true;
}
else{
return false;
}

}
Palindrome ("Eye");

4. Find the longest word in a string and return its length.

function Findlongestword (str) {
var arr=[];
var arr1=[];
var num=0;
Arr=str.split ("");
for (i=0;i<arr.length;i++) {

Arr1.push (arr[i].length);

}

Num=math.max.apply (NULL,ARR1);
return num;
}
Findlongestword ("May, the force is with You");
5. Capitalize the first letter of each word in the string, with the other letters lowercase
var arr=[];
function Titlecase (str) {
Str=str.tolowercase ();
Arr=str.split ("");
for (i=0;i<=arr.length;i++) {
Arr[i].charat (0). toUpperCase ();
}
Str=arr.join ("");
return str;
}

Titlecase ("I ' m a Little tea pot");
6. Find the largest number of each element in a two-dimensional array, and put those numbers in a new array as the function return value.

function Largestoffour (arr) {

var num=0;
var arr1=[];
for (i=0;i<arr.length;i++) {

Num=math.max.apply (Null,arr[i]);
Arr1.push (num);

}

return arr1;
}
Largestoffour ([[4, 9, 1, 3], [13, 35, 18, 26], [32, 35, 97, 39], [1000000, 1001, 857, 1]]);

7. Write a function that detects whether the end of a string is a given character, the first argument is a string, and the second argument is the character to be matched to its end. You cannot use the Endwidth () method.

function confirmending (str, target) {

var str1=[];
var num=target.length;
Str1=str.substr (Str.length-num,num);
if (str1==target) {
return true;
}
else{
return false;
}
}
Confirmending ("Bastian", "n");

JavaScript notes (ii)--application of common arrays and string methods