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Building a lexicographically increasing sequence of first n natural numbers in JavaScript
Problem
We are required to write a JavaScript function that takes in a number n and return an array containing first n natural number.
The only condition is that the numbers should be sorted lexicographically which means all the numbers starting with 1 should come before any starting with 2 or 3 or 4 and so on.
Example
Following is the code −
const num = 24;
const buildLexicographically = (num = 1) => {
const res = [];
const curr = num >= 9 ? 9 : num;
for (let i = 1; i <= curr; i++) {
res.push(i);
for (let j = i * 10; j<=num; j++) {
res.push(j)
if(j % 10 === 9){
break;
}
}
};
return res;
};
console.log(buildLexicographically(num));Output
Following is the console output −
[ 1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 2, 20, 21, 22, 23, 24, 3, 4, 5, 6, 7, 8, 9 ]
Updated on: 17-Apr-2021
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