JavaScipt String function and features

String

String Quotes

Strings can be enclosed within either single quotes, double quotes.

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Backtick quotes

• process expression

• process function

• multi line

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Special characters

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Accessing characters

Notes:
The only difference between them is that if no character is found, [] returns undefined, and charAt returns an empty string.

iterate character by character

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String length

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Changing the case

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Searching for a substring

str.indexOf

• returns the position where the match was found
• -1 if nothing can be found.

str.lastIndexOf(substr, position)
There is also a similar method str.lastIndexOf(substr, position) that searches from the end of a string to its beginning. It would list the occurrences in the reverse order.

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includes

The more modern method str.includes(substr, pos) returns true/false depending on whether str contains substr within. It’s the right choice if we need to test for the match, but don’t need its position

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str.startsWith and str.endsWith

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