JavaScript String Slicing Techniques

In JavaScript, you can use the following tricks to trim and slice strings:

1. The substring() method is used to extract a portion of a string, taking two parameters: the starting position and the ending position. For example: str.substring(startIndex, endIndex), where startIndex is the index of the starting position and endIndex is the index of the ending position (excluding the character at that position).
2. To extract a substring from a string, you can use the substr() method, which takes two parameters – the starting index and the length of the substring to be extracted. For example: str.substr(startIndex, length), where startIndex is the index of the starting position, and length is the length to be extracted.
3. The slice() method is used to extract characters from a string, it also accepts two parameters which are the starting position and the ending position (optional). If only one parameter is provided, it means to extract characters from that position to the end of the string. For example: str.slice(startIndex, endIndex).
4. Use the split() method to divide a string, which accepts a separator as a parameter, divides the string according to the separator, and returns an array. For example: str.split(separator), where separator is the character or regular expression used to divide the string.
5. Use regular expressions to extract, split, and manipulate strings. You can use the match() method to find parts of the string that match the regular expression, or use the replace() method to replace parts of the string that match the regular expression.