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im trying to Find the Smallest and Biggest Numbers. i can do this in for > let. but when i try to put this in a function it does not work.
const myNumbers = [1111, 245, 535 ,222, 221,12,233444];
function findnum(){
for (let i=0; i < myNumbers.length ; i++ ){
const smallNum = Math.min(...myNumbers)
const bigNum = Math.max(...myNumbers)
break
}
}
result = findnum(smallNum,bigNum)
console.log(result)
If you pass two variables to a function like this result = findnum(smallNum, bigNum), then you should have the function's signature with two arguments, like this:
function findnum(smallNum, bigNum){
Pay attention that smallNum and bigNum only exist inside the function. As #pilchard mentioned, in your code you don't need arguments, the loop is unnecessary, and the function needs a return.
This should work.
const myNumbers = [1111, 245, 535 ,222, 221, 12, 233444];
function findnum(){
const smallNum = Math.min(...myNumbers)
const bigNum = Math.max(...myNumbers)
return [smallNum, bigNum]
}
result = findnum()
console.log(result)
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I'm asked to get attributes collection out of an array object,
let a = [
{name:'aname',age:21},
{name:'bname',age:22},
{name:'cname',age:23},
{name:'dname',age:24},
{name:'ename',age:25},
{name:'fname',age:26},
{name:'gname',age:27}]
// wanted
let ok = {
names:'aname;bname;cname;dname;ename;fname;gname',
ages:'21;22;23;24;25;26;27'
}
and I got 2 ways of doing it:
alpha just using map of an array:
// alpha
let res = {
names:'',
ages:''
}
res.names=a.map(iter=>iter.name).join(';')
res.ages=a.map(iter=>iter.age).join(';')
//then return res
// ========================================================
and beta just iterate the array and append each attribute in the tabulation array:
// beta
let res = {
names:[],
ages:[]
}
a.forEach(iter=>{
res.names.push(iter.name)
res.ages.push(iter.age)
})
// then handle res's fields
ok.names = res.names.join(';')
ok.ages = res.ages.join(';')
so which way should I use to get the collection? Will alpha get slower or faster than beta when the objects in a get lots of fields(attrs)?
Both approaches are good. I'd say it depends on your personal preference what you'd want to use.
However, It seems to me that if you are aiming for performance, the following would yield better results.
let a = [
{name:'aname',age:21},
{name:'bname',age:22},
{name:'cname',age:23},
{name:'dname',age:24},
{name:'ename',age:25},
{name:'fname',age:26},
{name:'gname',age:27}]
let ok = { names: '', ages: ''}
for (let i = 0; i < a.length; i++){
const iter = a[i]
ok.names += iter.name + ";";
ok.ages += iter.age + ";";
}
ok.names = ok.names.slice(0,-1)
ok.ages = ok.ages.slice(0,-1)
console.log(ok)
This apporach eliminates the need to create new arrays or joining them (join is a heavy operation). Just create the string you want and at the end of it all, remove the one extra semicolon.
I consider that alfa is simpler and clearer for me, but I guess it is up to you...
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Is this the right way to remove a given character from String?
////not using replace method
function removeChar(str1, s) {
let temp = str1.split('')
let temp2 = []
for (i = 0; i < temp.length; i++) {
if (temp[i] != s) {
temp2.push(temp[i])
}
}
console.log(temp2.join(''));
}
removeChar("Hello","l")
You can do something like this
function removeChar(str1, s) {
return str1.split(s).join('')
}
this is another solution without replace()
const removeChar = (word, letter) => word.split("").filter(v => v !== letter).join("");
Just use the inbuilt replace function of javascript.
newString = oldString.replace(characterToBeReplaced, '');
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I am a beginner in JavaScript and I write the following code, I also write console.log(), and I do not get results, can someone help me and explain to me why I can't get results?
function integers() {
let MyArray;
MyArray = [];
for (let i = 2; i <= 10; i++) {
MyArray.push(i);
}
console.log(MyArray);
}
The javascript functions are not being called automatically. If you need to do so, You can create an auto call function - https://stackoverflow.com/a/10704006/7078456
Or you can manually call your function to get the output of your function.
function integers() {
let myArray = [];
for (let i = 2; i <= 10; i++) {
myArray.push(i);
}
console.log(myArray);
}
integers()
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I am trying to figure out how I can create a "game" where I have three dices, and three bets. If any of the bets hits, I will be granted 1 point, else nothing happens.
Example variables and arrays I would like to use;
var points = 1;
var slot1 = Math.floor((Math.random()*6)+1);
var slot2 = Math.floor((Math.random()*6)+1);
var slot3 = Math.floor((Math.random()*6)+1);
var dices = [slot1, slot2, slot3];
function Bet(bet1, bet2, bet3) {
"NEED HELP WITH THE CODE HERE"
}
Bet(1,2,3);
Thanks alot for all kinds of help!
I think a nudge in the right direction is more appropriate than a ready-to-go answer, since your question smells a little bit like homework :-)
You basically need to cross-check each item from both lists. You can do this with either a nested for .. in loop or a call to .some() with a nested .contains(). The latter will give you the cleanest solution. Docs
Alternatively, you can use Tagas' solution but that would make your function less reusable. If the number of bets vary, you'll need to adjust your function..
Try this:
function rollDice() {
//generate a number between 1 to 6
return Math.floor(Math.random() * (6 - 1 + 1)) + 1;
}
function makeBet(bet1, bet2, bet3) {
let slot1 = rollDice(),
slot2 = rollDice(),
slot3 = rollDice();
console.log('Slot 1:', slot1);
console.log('Slot 2:', slot2);
console.log('Slot 3:', slot3);
if(bet1 == slot1 || bet2 == slot2 || bet3 == slot3) {
//return 1 point as there is a match
return 1;
}
//return nothing as there was no match
return 0;
}
//Make a bet!
makeBet(1, 2, 3);
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I want to convert "1,2,3" to [1,2,3].
But there is an exception when converting "" to array. Because I get [""]. That is not valid for my case. So I need to check is it number or String. Let see this in code
function someWayToParse(some_string) {
var final_product = [];
var tmp_array = some_string.split(',');
//if some_string == "" tmp_array will result [""];
if (tmp_array[0].length===0)
return [];
for (var item in tmp_array)
final_product.push(parseInt(tmp_array[item], 10));
return final_product;
}
var stringToParse = "1,2,3";
var array_of_ints = someWayToParse(stringToParse);
I am just looking the best way to do this in a function and avoid possible mistakes.
Please be memory efficient, for my curiosity's sake.
Smaller code for it would be:
function myConverter(string) {
if (!string) return [];
return string.split(',').map(Number);
}
console.log(myConverter('1,2,3'));