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I have an items array with specific length depending on how many items in an order there are.
I have to calculate the packaging for it, for every 2 items I use the large box and the single item goes in a small box.
So if there are 5 items its 2 large boxes and 1 small box.
How do I do this using the array length? or any other way?
Use the modulo operator:
let numBigBoxes = 0;
let numSmallBoxes = 0;
if (items.length === 1) {
numSmallBoxes = 1;
} else if (items.length % 2 === 0) {
numBigBoxes = items.length / 2;
} else {
numBigBoxes = (items.length - 1) / 2;
numSmallBoxes = 1;
}
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Here are two arrays:
array1=['alex','joe','simon','sarah']
let index1= 0;
array2= [ [1,2,3,4,5,6,7],[1,2,3] , [1,2] ....]
let index2= 0;
Initially we are in array1 in index 0, I have a next button and whenever user clicks on it index2 moves and its value become 1, then with next click it is 2 and so on and so forth.
The problem is I want to change indeex1 whenever the navigation of the first array of array 2 is finished.
What I mean is when index2 is equal to 6 the index1 should change to 1.
How can I achieve this?
This is just an example
const array1 = ['alex','joe','simon','sarah']
let index1 = 0;
const array2 = [ [1,2,3],[1,2,3],[1,2]]
let index2= 0;
function userClick(arr){
if (arr[index1].length > index2) {
console.log(index1, index2);
index2++;
}
else {
index1++;
index2 = 0;
}
}
for (let i = 0; i < 7; i++) {
userClick(array2);
}
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Why is my loop not working in JavaScript?
for (n = 1; n<4; n++)
{
var my_buttons = "";
my_buttons = my_buttons + `<div class="click" id="color${n}"></div>`;
document.getElementById("clicky").innerHTML = my_buttons;
}
You have two problems:
First you were overwriting my_buttons by declaring it within the loop. Second you were adding that overwritten variable to innerHTML within the loop also, so the content never got saved together.
my_buttons = "";
for (let n = 1; n<4; n++)
{
my_buttons = my_buttons + `<div class="click" id="color${n}"></div>`;
}
document.getElementById("clicky").innerHTML = my_buttons;
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I have that variable. var count_br = "4,7,10"
var count_ = count_br.split(",");
var i;
for (i = 0; i < count_.length; ++i) {
/// Increment here each values of count_br
// I want to get 8,11,14
//for the next loop I want to get 12,15,18
//etc
}
Each time if i > 0 I want to increment by 4 all the values of count_br.
How could i do to increment by 4 all the values .
thanks.
var count_br = "4,7,10";
var count_ = count_br.split(",");
var i;
for (i = 0; i < count_.length; ++i) {
for(let idx in count_) count_[idx] = (parseInt(count_[idx])+4).toString()
}
console.log(count_)
you should take the length of the variable... in this case 4... less 1 is 3 and use it on a for to go trougth all the positions of you array and for each iteration you add 4
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I need to create an array or json that can be filled when detects the counter like an auxiliarJson with variable size but i dont know how can i do it
TypeError: lAttrsPorDia is undefined
lAttrsPorDia[j] = __oATTRS[i];
var lAttrsPorDia;
var j = 0;
for (var i = 0; i < __oATTRS.length; i++) {
if (__oATTRS[i].Dia == counter) {
lAttrsPorDia[j] = __oATTRS[i];
j++;
alert(JSON.stringify(lAttrsPorDia));
}
}
JavaScript arrays already do have variable size:
var arr = [];
arr.push('Hello');
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This is more of an academic/homework question?
Would it be better to change
if (index_outer !== index_min) {
$P.swap(arr, index_outer, index_min);
}
to
$P.swap(arr, index_outer, index_min);
and always swap, as this is the special case when index_outer does have the smallest value? It would be a swap that does nothing, but at the same time it would not break anything. Because this does not happen often I suppose, it would reduce the amount of times an if check was used.
$P.swap = function (arr, i, j) {
var temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
};
$P.selectionSort = function (arr) {
var index_outer,
index_inner,
index_min,
length = arr.length;
for (index_outer = 0; index_outer < length; index_outer++) {
index_min = index_outer;
for (index_inner = index_outer + 1; index_inner < length; index_inner++) {
if (arr[index_inner] < arr[index_min]) {
index_min = index_inner;
}
}
if (index_outer !== index_min) {
$P.swap(arr, index_outer, index_min);
}
}
return arr;
};
I don't think it would always be a good idea. What if array was partially/fully sorted, you would be wasting a call to $P.swap().
As for improving selection sort try sorting the array from both ends simultaneously by taking index_min and index_max. Though number of comparisons would remain same, number of passes would decrease hence decreasing total run time.