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What's the shortest way to convert any JavaScript value to a string?

I have a function, say:

setValue: function(myValue) {
  ...
}

The caller can pass a string, number, boolean, or object. I need to make sure that the value passed down the line is a string. What's the safest way to do this? I understand that some types (like Date) can be converted to strings, but I'm just looking for something sane out of the box.

I could write a series of operators like:

if (typeof myValue == "boolean") {}
else if () {}
...

But this can be error prone as types can be omitted.

Firefox seems to support things like:

var foo = 10; foo.toString()

But will this work with all web browsers? I need to support IE 6 and up.

In short, what is the shortest way to perform the conversion while covering each individual type?

-Erik

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5 answers 


var stringValue = String(foo);

or even shorter



var stringValue = "" + foo;
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value += '';


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If you are using myValue

as a string, Javascript will imply the conversion to a string. If you need to hint at the Javascript engine that you are dealing with a string (like using the + operator), you can safely use toString in IE6 and up.

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how to format string context eg. "" + Foo?

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Another way:

var stringValue = (value).toString();
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