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Shift certain array elements to front of array - JavaScript
We are required to write a JavaScript function takes in an array of numbers. The function should bring all the 3-digit integers to the front of the array.
Let’s say the following is our array of numbers −
const numList = [1, 324,34, 3434, 304, 2929, 23, 444];
Example
Following is the code −
const numList = [1, 324,34, 3434, 304, 2929, 23, 444];
const isThreeDigit = num => num > 99 && num < 1000;
const bringToFront = arr => {
for(let i = 0; i < arr.length; i++){
if(!isThreeDigit(arr[i])){
continue;
};
arr.unshift(arr.splice(i, 1)[0]);
};
};
bringToFront(numList);
console.log(numList);Output
This will produce the following output in console −
[ 444, 304, 324, 1, 34, 3434, 2929, 23 ]
Updated on: 30-Sep-2020
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