/
app.js
249 lines (198 loc) · 4.28 KB
/
app.js
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var prompt = require('sync-prompt').prompt;
//Increment function
//
function increment(x){
x++;
return x;
}
var z = increment(3);
console.log(z);
var z = increment(7);
console.log(z);
var z = increment(9);
console.log(z);
var z = increment(12);
console.log(z);
//Square function
//
function square (x){
x *= x;
return x;
}
var y = square(2);
console.log(y);
y = square(56);
console.log(y);
y = square(9);
console.log(y);
y = square(2);
console.log(y);
//Area function
//
function area(length, width){
return length * width;
}
var r = area(2,2);
console.log(r);
r = area(4,4);
console.log(r);
r = area(6,6);
console.log(r);
r = area(8,8);
console.log(r);
//Volume function
//
function volume (length, width, height){
return area(length,width) * height;
}
var v = volume(2,2,2);
console.log(v);
v = volume(4,4,4);
console.log(v);
v = volume(6,6,6);
console.log(v);
v = volume(8,8,8);
console.log(v);
//Calling and printing a series of functions
//
var k;
k = (area(square(increment(3) + increment(4)), square(2)));
console.log(k);
//sayHello function: no inputs, no outputs; returns 'hello!' in console
//
function sayHello (){
console.log('hello!');
}
sayHello();
//makeUpper function: returns a string input into ALL CAPS
//
function makeUpper(string){
return string.toUpperCase();
}
var txt = makeUpper('hello!');
console.log(txt);
//canDrink function: returns if a person of x can drink or not (Boolean T/F)
//
function canDrink(age){
return (age >= 21);
}
var legal = canDrink(15);
console.log('Can you drink?',legal);
legal = canDrink(30);
console.log('Can you drink?',legal);
legal = canDrink(55);
console.log('Can you drink?',legal);
legal = canDrink(4);
console.log('Can you drink?',legal);
//Letter grade function: returns letter grade
//
function letterGrade(grade){
if(grade >= 90){
return 'A';
}else if(grade >= 80){
return 'B';
}else if(grade >= 70){
return 'C';
}else if(grade >= 60){
return 'D';
}else{
return 'F';
}
}
var grade = letterGrade(99);
console.log(grade);
grade = letterGrade(82);
console.log(grade);
grade = letterGrade(72);
console.log(grade);
grade = letterGrade(61);
console.log(grade);
grade = letterGrade(33);
console.log(grade);
//Add tax function: returns price + tax = totalCost.
//
function addTax(goods, taxPct){
return goods + (goods * (taxPct/100));
}
var totalPrice = addTax(100,10);
console.log('$' + totalPrice.toFixed(2));
totalPrice = addTax(200,10);
console.log('$' + totalPrice.toFixed(2));
totalPrice = addTax(300,10);
console.log('$' + totalPrice.toFixed(2));
totalPrice = addTax(400,10);
console.log('$' + totalPrice.toFixed(2));
/*Sum function: creates a function that adds the values of an array.
* When you call the function, you MUST reference an exiting array, or enter the numbers manually.
*/
function sum(numbers){
var sigma = 0;
for(var i = 0; i < numbers.length; i++){
sigma += numbers[i];
}
return sigma;
}
var sum = sum([2,4,6,8]);
console.log('Σ = ' + sum);
//Factorial function: returns factorial of a number
//
function factorial(number) {
if (number == 0 || number == 1){
return 1;
}else{
return factorial(number - 1) * number;
}
}
var product = factorial(0);
console.log(product);
product = factorial(1);
console.log(product);
product = factorial(2);
console.log(product);
product = factorial(3);
console.log(product);
product = factorial(4);
console.log(product);
product = factorial(5);
console.log(product);
//OR
function factorial(number){
var product = 1;
for(var i = 2; i <= number; i++){
prodduct
}
return product;
}
var product = factorial(5);
console.log(product);
//Die roll function: returns random number between 1 - 6
//
function rollDie(){
return Math.floor(Math.random() * 6) + 1;
}
var d;
for(var i = 0; i < 10; i++){
d = rollDie();
console.log('roll: ', d);
}
//isPair function: compares 2 numbers and returns if same #s (t/f)
//
function isPair(roll1, roll2){
return roll1 === roll2;
}
var rollSame = isPair(2,2);
console.log('Same number? ',rollSame);
//countPair function: returns the number of pairs in x dice rolls
//
function countPairs(x){
var totalPairs = 0;
for(var j = 0; j < x; j++){
if(isPair(rollDie(), rollDie()));
totalPairs++;
}
}
return totalPairs;
}
var z;
z = countPairs(10000);
console.log(z);