问题
I just came home from a job interview, and the interviewer asked me to write a program:
It should, count from 1 to 100, and print...
If it was multiple of 3, "ping"
If it was multiple of 5, "pong"
Else, print the number.
If it was multiple of 3 AND 5 (like 15), it should print "ping" and "pong".
I chose Javascript, and came up with this:
for (x=1; x <= 100; x++){
if( x % 3 == 0 ){
write("ping")
}
if( x % 5 == 0 ){
write("pong")
}
if( ( x % 3 != 0 ) && ( x % 5 != 0 ) ){
write(x)
}
}
Actualy, I left very unhappy with my solution, but I can't figure out a better one.
Does anyone knows a better way to do that? It's checking twice, I didn't like it. I ran some tests here at home, without success, this is the only one that returns the correct answer...
回答1:
Your solution is quite satisfactory IMHO. Tough, as half numbers are not multiple of 3 nor 5, I'd start the other way around:
for (var x=1; x <= 100; x++){
if( x % 3 && x % 5 ) {
document.write(x);
} else {
if( x % 3 == 0 ) {
document.write("ping");
}
if( x % 5 == 0 ) {
document.write("pong");
}
}
document.write('<br>'); //line breaks to enhance output readability
}
Fiddle
Also, note that any number other than 0 and NaN are truthy values, so I've removed the unnecessary != 0 and some pairs of parenthesis.
Here's another version, it doesn't make the same modulus operation twice but needs to store a variable:
for (var x=1; x <= 100; x++) {
var skip = 0;
if (x % 3 == 0) {
document.write('ping');
skip = 1;
}
if (x % 5 == 0) {
document.write('pong');
skip = 1;
}
if (!skip) {
document.write(x);
}
document.write('<br>'); //line breaks to enhance output readability
}
Fiddle
回答2:
Here's my one-liner:
for(var x=1;x<101;x++)document.write((((x%3?'':'ping')+(x%5?'':'pong'))||x)+'<br>');
I'm using ternary operators to return either an empty string or 'ping'/'pong', concatenating the result of these operators, then doing an OR (if the number is neither divisible by 3 or 5, the result of the concatenation is '' which is FALSEY in javascript). When both cases are true, the result of the concatenation is 'pingpong'.
So basically it comes down to
'' || x // returns x
'ping' || x // returns 'ping'
'pong' || x // returns 'pong'
'pingpong' || x // returns 'pingpong'
回答3:
The best solution I came up with is this one:
for (var i = 1; i <= 100; i++) {
var message = '';
if (i%3 === 0) message += 'ping';
if (i%5 === 0) message += 'pong';
console.log(message || i);
}
回答4:
Here's a solution which allows for a dynamic list of multiples without adding more conditionals.
// List of outputs
var outputs = [
{mult: 3, str: 'ping'},
{mult: 5, str: 'pong'}
// {mult: 10, str: 'play'} ex: [30] => 'pingpongplay'
];
// Loop 100 times
for (var i = 1, j = 100; i <= j; i += 1) {
// Set empty vars
var result, string = '';
// Loop through the listed output objects
outputs.forEach(function (output) {
// If listed multiple, concat string
if (i % output.mult === 0) {
string += output.str;
}
});
// Set result
if (string.length) {
result = string;
} else {
result = i;
}
// print result
document.body.innerHTML += result + '<br>';
}
And as a function which passes jslint:
/*jslint browser: true */
var printOutputs = function (array, iterations) {
'use strict';
var i = 1;
var outputResults = function (arr, idx) {
var result;
var str = '';
arr.forEach(function (item) {
if (idx % item.mult === 0) {
str += item.str;
}
});
if (str.length) {
result = str;
} else {
result = idx;
}
return result;
};
while (i < iterations) {
document.body.innerHTML += outputResults(array, i) + '<br>';
i += 1;
}
};
var outputs = [
{mult: 3, str: 'ping'},
{mult: 5, str: 'pong'}
];
printOutputs(outputs, 100);
And for fun, a minified ES6 version:
const pO=(arr,itr)=>{let i=1,o=(a,idx)=>{let r,s='';a.map(v=>{if(idx%v.mult===0)s+=v.str});s.length?r=s:r=idx;return r};while(i<itr){document.body.innerHTML+=`${o(arr,i)}<br>`;i++}};
pO([{mult:3,str:'ping'},{mult:5,str:'pong'}], 100);
回答5:
I wrote a few variations on this (using fizz and buzz) as a benchmark to consider different ways of iterating over conditional logic.
while won again:
// Iterate using a recursive function
// firing a callback once per iteration
function f(s,n) {
if(++n >= 102) return;
s === '' ? console.log(n-1) : console.log(s);
!!(n % 3)
? !!(n % 5)
? f('',n) : f('Buzz',n)
: !!(n % 5)
? f('Fizz',n) : f('FizzBuzz',n);
}
// Iterate using a `while` loop
// firing a callback after satisfying a condition
function b(n) {
var i = n;
$:
while(++i) {
if(i % 3)
if(i % 5)
console.log(i);
else
console.log('Buzz');
else if(i % 5)
console.log('Fizz');
else
console.log('FizzBuzz');
if(i >= 100)
break $;
}
return;
}
// Iterate using a `for` loop
// firing a callback once per iteration
function F(n) {
var i = n, f = 'Fizz', b = 'Buzz', o = '';
for (; i <= 100; i++) {
o = !(i % 3)
? !(i % 5)
? f + b : f
: !(i % 5)
? b : i;
console.log(o);
}
return;
}
// Iterate using a `for` loop
// firing a callback after satisfying a condition
function B(n) {
var i = n;
var fiz = 'Fizz';
var buz = 'Buzz';
for(; i <= 100; i++)
if(!(i % 3))
if(!(i % 5))
console.log(fiz + buz);
else
console.log(fiz);
else if(!(i % 5))
console.log(buz);
else
console.log(i);
return;
}
f('', 1); // recursive
b(0); // `while`
F(1); // `for`
B(1); // `for
Benchmark: http://jsperf.com/fizzbuzz-mod
回答6:
//create a for loop to count from 0 to 100
for (let num = 0; num <= 100; num++){
/**As the count increments, if the number is divisible by 3 and divisible by 5
print FizzBuzz, I have concatenated the number with FizzBuzz for clarity.
Use % instead of \ to ensure it returns an int instead of float.**/
if ((0 == num % 3) && (0 == num % 5)){
console.log ("FizzBuzz" + " " + num);
//otherwise, if the number is divisible by 5 print Buzz
} else if (0 == num % 5) {
console.log("Buzz" + " " + num);
//Also, if the number is divisible by 3 print Fizz
} else if (0 == num % 3){
console.log("fizz" + " " + num);
} else {
//meanwhile, still print all the numbers that don't satisfy the conditions above
console.log (num);
}
}回答7:
for( int number = 1 ; number < 100 ; number++ )
{
boolean shouldPrintNumber = true;
System.out.println("\n");
if( (number%3) == 0 )
{
System.out.print("ping");
shouldPrintNumber = false;
}
if( (number%5) == 0 )
{
System.out.print("pong");
shouldPrintNumber = false;
}
if( shouldPrintNumber )
{
System.out.print( number );
}
}
回答8:
for var a = 1; a <= 100 ; a++
{
if a % 3 == 0 && a % 5 == 0
{
println("Fizzbuzz")
continue
}
if a % 5 == 0
{
println("Buzz")
continue
}
if a % 3 == 0
{
println("Fizz")
continue
}
else
{
println(a)
}
}
回答9:
To get rid of the last condition you might use continue:
for (x=1; x <= 100; x++){
if( x % 3 == 0 ){
write("ping")
continue
}
if( x % 5 == 0 ){
write("pong")
continue
}
write(x)
}
来源：https://stackoverflow.com/questions/13845437/from-1-to-100-print-ping-if-multiple-of-3-pong-if-multiple-of-5-or-else-p