Longest Digits Prefix
Description
Given a string, output its longest prefix which contains only digits.
Note: A substring of a string is called a prefix if it starts at the string’s first character.
Example
For inputString="123aa1", the output should be
longestDigitsPrefix(inputString) = "123".
Input/Output
-
[execution time limit] 4 seconds (js)
-
[input] string inputString
Guaranteed constraints:
3 ≤ inputString.length ≤ 35.
- [output] string
[JavaScript (ES6)] Syntax Tips
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// Prints help message to the console
// Returns a string
function helloWorld(name) {
console.log("This prints to the console when you Run Tests");
return "Hello, " + name;
}
Solution
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function longestDigitsPrefix(inputString) {
for(var i = 0; i < inputString.length; i++) {
if(!/\d/.test(inputString[i]))
break
}
return inputString.substring(0,i);
}