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Column formatted string in Javascript

Although I worked with it in C and Java, I forgot the basic output method for getting placeholders for creating columns in text output:

Oakenshield Thorin Baggins Bilbo Gray, the Gandalf

Then, as soon as this function is known, where can I find a standalone library for this in Javascript?

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2 answers

Do you mean sprintf() a width format specifier (e.g. %20d )? If so, Javascript sprintf is really your answer.

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How do i do it

 var data = [["Oakenshield", "Thorin"], ["Baggins", "Bilbo"], ["Gray, the", "Gandalf"]]; var display = document.querySelectorAll("[id^=display]"); Library: var pads = (x,len,z=" ") => (x + Array(len).fill(z).join("")).slice(0,len); var padn = (x,len,z=0,base) => (Array(len).fill(z).join("") + x.toString(base)).slice(-len); var sprintf = (str, ...argv) => !argv.length ? str : sprintf(str = str.replace(sprintf.token||"$", argv.shift()), ...argv); Demo1: var f = item => sprintf("$$\n", pads(item[0],16), pads(item[1],16)); display[0].innerHTML = data.map(f).join(""); Demo2: var f = (item,i) => sprintf("$ $ $ $\n", padn(i,4), padn(item[1],6," "), pads(item[0],9), padn(i,4,0,2)); display[1].innerHTML = data.map(f).join(""); 
 <b>Demo 1:</b><pre id="display1" style="margin-top: 0"></pre> <b>Demo 2:</b><pre id="display2" style="margin-top: 0"></pre>
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