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JavaScript to push value in empty index in array
We have an array that contains some empty values inside it like this −
const arr = [43,534534,645,64,,645,64,,645,,645,,65,,645,,64];
We are required to write an Array function pushAtEmpty() which takes in an element and pushes it at the first empty index it finds in the array it is used in context of. If there are no empty spaces, the element should be pushed at the last of the array.
Let’s write the code for this function. We will first search for the index of empty position and then replace the value there with the value we are provided with.
Example
const arr = [43,534534,645,64,,645,64,,645,,645,,65,,645,,64];
Array.prototype.pushAtEmpty = function(element){
let index;
for(index = 0; index < this.length; index++){
if(arr[index] === undefined){
this.splice(index, 1, element);
break;
};
};
if(index === this.length){
this.push(element);
}
};
arr.pushAtEmpty(23);
arr.pushAtEmpty(33);
arr.pushAtEmpty(43);
arr.pushAtEmpty(53);
arr.pushAtEmpty(63);
arr.pushAtEmpty(73);
arr.pushAtEmpty(83);
arr.pushAtEmpty(93);
console.log(arr);Output
The output in the console will be −
[ 43, 534534, 645, 64, 23, 645, 64, 33, 645, 43, 645, 53, 65, 63, 645, 73, 64, 83, 93 ]
Updated on: 26-Aug-2020
909 Views
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