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How do I make the first letter of a string uppercase in JavaScript?

How do I make the first character of a string uppercase if it's a letter, but not change the case of any of the other letters?

For example:

"this is a test" → "This is a test"
"the Eiffel Tower" → "The Eiffel Tower"
"/index.html" → "/index.html"

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9

@999: where does it say that substr() is deprecated? It's not, even now, three years later, let alone back in 2009 when you made this comment.

Dan Dascalescu
– Dan Dascalescu

2012年11月07日 06:12:41 +00:00
Commented Nov 7, 2012 at 6:12
substr() may not be marked as deprecated by any popular ECMAScript implementation (I doubt it's not going to disappear anytime soon), but it's not part of the ECMAScript spec. The 3rd edition of the spec mentions it in the non-normative annex in order to "suggests uniform semantics for such properties without making the properties or their semantics part of this standard".

Peter Rust
– Peter Rust

2012年11月21日 22:05:22 +00:00
Commented Nov 21, 2012 at 22:05
3

Having 3 methods that do the same thing (substring, substr and slice) is too many, IMO. I always use slice because it supports negative indexes, it doesn't have the confusing arg-swapping behavior and its API is similar to slice in other languages.

Peter Rust
– Peter Rust

2012年11月21日 22:12:12 +00:00
Commented Nov 21, 2012 at 22:12

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How do I make the first letter of a string uppercase in JavaScript?

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