From 9af15faf0831151a7c37c57a229d3f4c4d05ea72 Mon Sep 17 00:00:00 2001 From: Rohit Date: Thu, 21 Dec 2017 15:53:54 +0530 Subject: [PATCH] Fixed a typo --- snippets/primes.md | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/snippets/primes.md b/snippets/primes.md index 31dafc045..2714a8e60 100644 --- a/snippets/primes.md +++ b/snippets/primes.md @@ -1,15 +1,14 @@ ### primes -It generates primes till a given number ```m - -Explain briefly how the snippet works. +It generates primes till a given number. +It works with the Sieve of Eratosthenes. It generate an array from 2 to the given number. Then it filters out the values (Using Array.filter()) divisible by any number from 2 to square root of the provided number. ```js -const primes = num =>{ +const primes = num => { var arr = Array.from({length:num-1}).map((x,i)=> i+2); var sqroot = Math.floor(Math.sqrt(num)); - var numsTillSqroot = Array.from({length:numb-1}).map((x,i)=> i+2); - arra.forEach(x => arr = arr.filter(y => ((y%x)!==0)||(y== x))); + var numsTillSqroot = Array.from({length:sqroot-1}).map((x,i)=> i+2); + numsTillSqroot.forEach(x => arr = arr.filter(y => ((y%x)!==0)||(y==x))); return arr; }// primes(10) -> [2,3,5,7] ``` \ No newline at end of file