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In javascript I have an array of something like 500,000 items.
I want to send to server 1000 items multiple times.
Seems that I need to use the Slice Function.
How can I do it send 1000 items each time and the last time send the last items. either if it less than 1000 items.
var splicedItems = [];
for(var i =0; i<=yourBigArr.length-1; i++)
{
splicedItems[] = yourBigArr.splice(0,1000);
}
splice is used to modify your array. In the above case we are splicing 1000 items and the each time the array would be reducing by 1000 items.So the index would always start from 0 and the items to chop would be 1000(as you have stated)
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I created button that is generate a random number every time , but in the console log it shows it like this:
small project i have been working on during course of javascript
I tried to make one array of random numbers and when it reach above 4 random numbers i will use Shift method to erase one. ( I also tried to use for loop )
What actually happen that is it kind of creates me new array inside of the orginal array
let randomArr = [];
if (randomArr.length >= 4) {
randomArr.shift();
lastNumbers.textContent -= randomArr + ",";
return randomArr;
} else {
randomArr.push(randomNumber);
// randomArr.length = randomArr;
lastNumbers.textContent += randomArr + ",";
// return randomArr;
}
Ty for helping!
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I want to create an Array from another by applying the proportionality rule.
For example:
Array1 = [15,550,76,3,400,230]
I take the maximum value from Array1 which is equal in my array 550
Now, with a function, I want to create a second array Array2 with a value equal to 10 which corresponds to 550 in the first array, like Array2 = [?,10,?,?,?,?]
I want to apply the proportionality rule function to determine the other values of Array2 to get Array2=[0.27,10,1.38,0.05,7.27,4.6]
Any help please how can I create the function with array param?
Thank you.
const array1 = [15,550,76,3,400,230]
function proportionalityRule(array){
const maxValue = Math.max(...array)
return array.map(element => (element/maxValue) * 10)
}
proportionalityRule(array1)
// (6) [0.2727272727272727, 10, 1.3818181818181818, 0.05454545454545455, 7.272727272727273, 4.181818181818182]
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I am working with an array in Javascript that contains several IDs in them but I would like to filter out all non-numeric entries using regex and return that array of just numbers. For example, I have myArray = ['131125150138677','CI%20UW%20SYSTEMS%20S','040964100010832'] where I want to get rid of the second item in the list since it's non-numeric.
So use Filter and test to see if they are numbers
var myArray = ['131125150138677', 'CI%20UW%20SYSTEMS%20S', '040964100010832']
var filtered = myArray.filter(Number)
console.log(filtered)
var filtered2 = myArray.filter(s => s.match(/^\d+$/))
console.log(filtered2)
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[1,2,3,4,5,6] should be changed to set containing {1,2},{2,3},{3,4},{4,5},{5,6} using normal for loop and using javascript map and reduce functions convert array to set of pairs using different techniques Thanks in Advance
Why not a simple for loop? Array functions are great but are often unnecessary.
const arr = [1,2,3,4,5,6]
const result = []
for (let i = 1; i < arr.length; ++i)
result.push([arr[i-1], arr[i]])
console.log(result)
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sorry i new learning about javascript:
i have code like this:
function call(arr) {
//i have no idea
}
console.log(call([1,2,3]));
i want to output:
//[6,3,2]
where result output obtained from [(2*3),(1*3),(1*2)]
It looks like you want each value in the array to be replaced with the value of all of the other elements multiplied together. You can calculate this more efficiently by first multiplying all of the numbers together, and then using division to take away just one number from the product at any one time, leaving the product of all the other numbers in the array.
Array.prototype.reduce
Array.prototype.map
function call(arr) {
var product = arr.reduce((a,b) => a * b, 1);
return arr.map(num => product / num);
}
console.log(call([1, 2, 3]));
Note that this won't work if a 0 appears anywhere in the array.