Exploring the Differences Between Slice and Substring in JavaScript

TLDRLearn about the slice and substring methods in JavaScript, which extract a section of a string without modifying the original. Slice uses the parameters 'start' and 'end' to define the section, while substring uses the 'start' and 'end' indexes. Negative indexes and the length of the string can also be used.

Key insights

⚡️The slice and substring methods in JavaScript both extract sections of a string and return a new string without modifying the original.

✂️Slice uses the 'start' and 'end' parameters to define the section, while substring uses the 'start' index and 'end' index.

🔀If the 'start' index is greater than the 'end' index, slice returns an empty string. Substring swaps the indexes and returns the section.

📐Negative indexes can be used with slice to start counting from the end of the string. Substring treats negative indexes as zero.

👍🏼Both methods return the extracted section of the string, but slice and substring handle edge cases differently.

Q&A

Can slice and substring modify the original string?

—No, both methods return a new string without modifying the original.

What are the parameters for slice?

—Slice takes 'start' and 'end' parameters to define the section of the string to extract.

How does substring handle negative indexes?

—Substring treats negative indexes as zero. Any negative number is treated as the start of the string.

What happens if the 'start' index is greater than the 'end' index?

—Slice returns an empty string, while substring swaps the indexes and returns the section.

Do slice and substring include the 'end' index?

—Slice does not include the 'end' index, while substring does include the 'end' index.

Timestamped Summary

00:00Slice and substring are methods in JavaScript used to extract sections of a string without modifying the original.

00:56Slice uses the 'start' and 'end' parameters to define the section, while substring uses the 'start' index and 'end' index.

02:10Negative indexes can be used with slice to start counting from the end of the string. Substring treats negative indexes as zero.

03:45If the 'start' index is greater than the 'end' index, slice returns an empty string. Substring swaps the indexes and returns the section.

04:59Both slice and substring return the extracted section of the string, but they handle edge cases differently.

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