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Algorithm to dynamically populate JavaScript array with zeros before and after values
We are given a months array, which elements less than 12, where each element will be between 1 and 12 (both inclusive). Our job is to take this array and create a full months array with 12 elements, if the element is present in the original array we use that element otherwise we use at that place.
For example −
Intput → [5, 7, 9] Output → [0, 0, 0, 0, 5, 0, 7, 0, 9, 10, 0, 0]
Now, let’s write the code −
Example
const months = [6, 7, 10, 12];
const completeMonths = (arr) => {
const completed = [];
for(let i = 1; i <= 12; i++){
if(arr.includes(i)){
completed.push(i);
}else{
completed.push(0);
}
};
return completed;
};
console.log(completeMonths(months));We iterated from 1 to 12, kept checking if the original array contains the current element, if yes then we pushed that element to the new array otherwise we pushed 0 to the new array.
Output
The output in the console for the above code will be −
[ 0, 0, 0, 0, 0, 6, 7, 0, 0, 10, 0, 12 ]
Updated on: 20-Aug-2020
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