Kishan Rami:
19. Write a JavaScript program to check a given integer is within 20 of 100 or 400

function testhundred(x) {
return ((Math.abs(100 - x) <= 20) ||
(Math.abs(400 - x) <= 20));
}

console.log(testhundred(10));
console.log(testhundred(90));
console.log(testhundred(99));
console.log(testhundred(199));
console.log(testhundred(200));

20. Write a JavaScript program to check from two given integers, if one is positive and one is negative.

function positive_negative(x, y)
{
if ((x < 0 && y > 0) || x > 0 && y < 0)
{
return true;
}
else
{
return false;
}
}
console.log(positive_negative(2, 2));
console.log(positive_negative(-2, 2));
console.log(positive_negative(2, -2));
console.log(positive_negative(-2, -2));

21. Write a JavaScript program to create a new string adding "Py" in front of a given string. If the given string begins with "Py" then return the original string.

function string_check(str1) {
if (str1 === null || str1 === undefined || str1.substring(0, 2) === 'Py')
{
return str1;
}
return "Py"+str1;
}

console.log(string_check("Python"));
console.log(string_check("thon"));

22. Write a JavaScript program to remove a character at the specified position of a given string and return the new string.

function remove_character(str, char_pos)
{
part1 = str.substring(0, char_pos);
part2 = str.substring(char_pos + 1, str.length);
return (part1 + part2);
}

console.log(remove_character("Python",0));
console.log(remove_character("Python",3));
console.log(remove_character("Python",5));

23. Write a JavaScript program to create a new string from a given string changing the position of first and last characters. The string length must be greater than or equal to 1.

function first_last(str1)
{
if (str1.length <= 1)
{
return str1;
}
mid_char = str1.substring(1, str1.length - 1);
return (str1.charAt(str1.length - 1)) + mid_char + str1.charAt(0);
}
console.log(first_last('a'));
console.log(first_last('ab'));
console.log(first_last('abc'));

24. Write a JavaScript program to create a new string from a given string with the first character of the given string added at the front and back.

function front_back(str)
{
first = str.substring(0,1);
return first + str + first;
}
console.log(front_back('a'));
console.log(front_back('ab'));
console.log(front_back('abc'));

25. Write a JavaScript program check if a given positive number is a multiple of 3 or a multiple of 7.

function test37(x)
{
if (x % 3 == 0 || x % 7 == 0)
{
return true;
}
else {
return false;
}
}

console.log(test37(12));
console.log(test37(14));
console.log(test37(10));
console.log(test37(11));

26. Write a JavaScript program to create a new string from a given string taking the last 3 characters and added at both the front and back. The string length must be 3 or more.

function front_back3(str)
{
if (str.length>=3)
{
str_len = 3;

back = str.substring(str.length-3);
return back + str + back;
}
else
return false;
}
console.log(front_back3("abc"));
console.log(front_back3("ab"));
console.log(front_back3("abcd"));

27. Write a JavaScript program to check if a string starts with 'Java' and false otherwise.

function start_spec_str(str)
{
if (str.length < 4)
{
return false;
}
front = str.substring(0, 4);
if (front == 'Java')
{
return true;
}
else
{
return false;
}
}

console.log(start_spec_str("JavaScript"));
console.log(start_spec_str("Java"));
console.log(start_spec_str("Python"));

28. Write a JavaScript program to check if two given integer values are in the range 50..99 (inclusive). Return true if either of them are in the said range.

function check_numbers(x, y)
{
if ((x >= 50 && x <= 99) || (y >= 50 && y <= 99))
{
return true;
}
else
{
return false;
}
}

console.log(check_numbers(12, 101));
console.log(check_numbers(52, 80));
console.log(check_numbers(15, 99));

29. Write a JavaScript program to check if three given integer values are in the range 50..99 (inclusive). Return true if one or more of them are in the said range.

function check_three_nums(x, y, z)
{
return (x >= 50 && x <= 99) || (y >= 50 && y <= 99) || (z >= 50 && z <= 99);
}

console.log(check_three_nums(50, 90, 99));
console.log(check_three_nums(5, 9, 199));
console.log(check_three_nums(65, 89, 199));
console.log(check_three_nums(65, 9, 199));

30. Write a JavaScript program to check if a string "Script" presents at 5th (index 4) position in a given string, if "Script" presents in the string return the string without "Script" otherwise return the original one.


function check_script(str)
{
if (str.length < 6) {
return str;
}
let result_str = str;

if (str.substring(10, 4) == 'Script')
{

result_str = str.substring(0, 4) + str.substring(10,str.length);

}
return result_str;
}

console.log(check_script("JavaScript"));
console.log(check_script("CoffeeScript"));

31. Write a JavaScript program to find the largest of three given integers.

function max_of_three(x, y, z)
{
max_val = 0;
if (x > y)
{
max_val = x;
} else
{
max_val = y;
}
if (z > max_val)
{
max_val = z;
}
return max_val;
}

console.log(max_of_three(1,0,1));
console.log(max_of_three(0,-10,-20));
console.log(max_of_three(1000,510,440));

32. Write a JavaScript program to find a value which is nearest to 100 from two different given integer values.

function near_100(x, y) {
if (x != y)
{
x1 = Math.abs(x - 100);
y1 = Math.abs(y - 100);

if (x1 < y1)
{
return x;
}
if (y1 < x1)
{
return y;
}
return 0;
}
else
return false;
}

console.log(near_100(90, 89));
console.log(near_100(-90, -89));
console.log(near_100(90, 90));

33. Write a JavaScript program to check if two numbers are in range 40..60 or in the range 70..100 inclusive.

function numbers_ranges(x, y) {
if ((x >= 40 && x <= 60 && y >= 40 && y <= 60)
||
(x >= 70 && x <= 100 && y >= 70 && y <= 100))
{
return true;
}
else
{
return false;
}
}

console.log(numbers_ranges(44, 56));
console.log(numbers_ranges(70, 95));
console.log(numbers_ranges(50, 89));

34. Write a JavaScript program to find the larger number from the two given positive integers, the two numbers are in the range 40..60 inclusive.

function max_townums_range(x, y){
if( (x >= 40) && (x <= 60) && (y >= 40 && y <= 60) ){
if(x === y){
return "Numbers are the same";
}else if (x > y){
return x;
}else{
return y;
}
}else{
return "Numbers don't fit in range";
}
}

console.log(max_townums_range(45, 60));
console.log(max_townums_range(25, 60));
console.log(max_townums_range(45, 80));

35. Write a JavaScript program to check a given string contains 2 to 4 numbers of a specified character.


function check_char(str, char)
{
ctr = 0;
for (let i = 0; i < str.length; i++)
{
if (str.charAt(i) == char) {
ctr++;
}
}
return (ctr >= 2 && ctr <= 4);
}

console.log(check_char("Python", "y"));
console.log(check_char("JavaScript", "a"));
console.log(check_char("Console", "o"));

36. Write a JavaScript program to check if the last digit of the three given positive integers is same

function last_digit(x, y, z)
{
if ((x > 0) && y > 0 && z > 0)
{
return (x % 10 == y % 10 && y % 10 == z % 10 && x % 10 == z % 10);
}
else
return false;
}

console.log(last_digit(20, 30, 400));
console.log(last_digit(-20, 30, 400));
console.log(last_digit(20, -30, 400));
console.log(last_digit(20, 30, -400));