You can find all the code in this post in the repo Github.
String prototype related challenges
String.prototype.repeat()
The key here is to handle different edge cases.
/**
* @param {number} count
* @return {string}
*/
// Time: O(1) | Space: O(1)
String.prototype.myRepeat = function (count) {
if (count < 0) {
throw new RangeError("count must be non-negative");
}
if (count === 0) {
return "";
}
return Array.from({ length: Math.round(count) + 1 }).join(this);
};
// Usage example
console.log("abc".myRepeat(0)); // => ""
console.log("abc".myRepeat(1)); // => "abc"
console.log("abc".myRepeat(2)); // => "abcabc"
console.log("abc".myRepeat(-1)); // => RangeError
String.prototype.trim()
Use regular expressions to make your day easier:
-
//for regular expression -
^matches the beginning -
$matches the ending -
gmatches all the patterns -
|acts like logic OR operator -
+means one or more characters -
\smatches all whitespace(spaces, tabs, line breaks)
/**
* @param {strint} str
* @return {string}
*/
// Time: O(1) | Space: O(1)
String.prototype.myTrim = function () {
return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, "");
// or
// return this.replace(/^[\s]+|[\s]+$/g, "");
};
// Usage example
const str = " Hello, World! ";
console.log(str.myTrim()); // => "Hello, World!"
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