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In Python I can use:

s = "x" * 10
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How in JavaScript, do I create a string n characters long without a loop?

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use String.repeat

"x".repeat(10);

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/repeat

On old browsers you could do

new Array(10).join('x')
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Excellent answer, sadly it doesn't work with ExtendScript (ESTK 3.8), which is what I'm using :(
Please note that you need to do Array(len + 1).join(chr) in order to get the desired number of characters. (Join adds a character between each item in the array, so it will add n-1 characters).
1

Use repeat method.

'x'.repeat(10);
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new Array(11).join('x')

For 10 x you need 11 in new Array so that 10th x is visible.

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