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Filtering out numerals from string in JavaScript
Problem
We are required to write a JavaScript function that takes in a string, str, which contains a combination of alphabets, special characters and numbers.
Our function should return a new string based on the input string that contains only the numbers present in the string str, maintaining their relative order.
For example, if the input to the function is −
const str = 'revd1fdfdfs2v34fd5gfgfd6gffg7ds';
Then the output should be −
const output = '1234567';
Example
Following is the code −
const str = 'revd1fdfdfs2v34fd5gfgfd6gffg7ds'; const pickNumbers = (str = '') => { let res = ''; for(let i = 0; i < str.length; i++){ const el = str[i]; if(+el){ res += el; }; }; return res; }; console.log(pickNumbers(str));
Output
Following is the console output −
1234567
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