nodeJS util.format passing an array

Question

I am using util.format to format a string like this:

util.format('My name is %s %s', ['John', 'Smith']);

The fact that the second parameter is an array: ['John', 'Smith'], prevents my code from replacing the second %s. But i need it to be an array because I don't know the exact number of the arguments that the string might have.

Do you have any solution to my problem? Thank's in advance.

EDIT: The string that contains the placeholders is not a predefined static string. I read it from a file so the placeholders might be anywhere in the string. For the same reason I also don't know the number of placeholders.

Answer 1

If you don't know how many variables are in that array, how do you know how many placeholders to define in your string ?

I'd suggest you only use one placeholder and just .join() the array, like

util.format('My name is %s', ['John', 'Smith'].join(' '));

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Update

I guess I got you wrong there, you can make usage of JavaScripts Function.prototype.apply to pass in arguments to a function from an Array source. This could look like

util.format.apply(util,['My name is %s %s','John', 'Smith']);

Of course you would need to .unshift() your placeholder string into that array aswell beforehand.

Answer 2

Do a for-each loop for every string object in table and replace every time one %s. (for example ['John', 'Smith'] has 2 strings)