Doesn't print anything when executed in node #1

New Issue

2017-07-14T06:40:15Z

raghavgujjar commented

2017-07-14 06:40:15 +00:00

(Migrated from github.com)

I'm on node version 6.11. I'm just using the basic example PRINTJ.sprintf("Hello %s", SheetJS);

I save this code in a file and run node <filename>. Doesn't print anything. console.log however still prints something

I'm on node version 6.11. I'm just using the basic example `PRINTJ.sprintf("Hello %s", SheetJS)`; I save this code in a file and run `node <filename>`. Doesn't print anything. `console.log` however still prints something

reviewher commented

2017-07-14 06:56:35 +00:00

(Migrated from github.com)

sprintf and vsprintf don't actually print anything to console. They just return the resulting string. It's explained in the JS Interface section of the README:

Instead of replicating the original C signature and errno, functions directly return the output string and throw Errors:

The documentation shows examples from a REPL session, where the REPL evaluates and prints out the result. To run a REPL, just run node:

$ node
> require('printj').sprintf("Hello %s", "SheetJS")
'Hello SheetJS'

Running node with -pe arguments evaluates and prints the result:

$ node -pe 'require("printj").sprintf("Hello %s", "SheetJS")'
Hello SheetJS

Running from a file, you need to explicitly console.log.

$ cat test.js
var PRINTJ = require("printj");
var output = PRINTJ.sprintf("Hello %s", "SheetJS"); // <-- this line does not print to console
console.log(output); // <-- must be forced
$ node test.js
Hello SheetJS

The documentation is somewhat confusing. It has the > prompt to indicate that the commands were run in the REPL but it's not explained anywhere. If you have any thoughts for improving the docs, we'd love to improve them!

`sprintf` and `vsprintf` don't actually print anything to console. They just return the resulting string. It's explained in the [JS Interface](https://github.com/sheetjs/printj#js-interface) section of the README: > Instead of replicating the original C signature and `errno`, functions directly return the output string and throw Errors: The documentation shows examples from a REPL session, where the REPL evaluates and prints out the result. To run a REPL, just run `node`: ``` $ node > require('printj').sprintf("Hello %s", "SheetJS") 'Hello SheetJS' ``` Running node with `-pe` arguments evaluates and prints the result: ``` $ node -pe 'require("printj").sprintf("Hello %s", "SheetJS")' Hello SheetJS ``` Running from a file, you need to explicitly console.log. ``` $ cat test.js var PRINTJ = require("printj"); var output = PRINTJ.sprintf("Hello %s", "SheetJS"); // <-- this line does not print to console console.log(output); // <-- must be forced $ node test.js Hello SheetJS ``` The documentation is somewhat confusing. It has the `>` prompt to indicate that the commands were run in the REPL but it's not explained anywhere. If you have any thoughts for improving the docs, we'd love to improve them!

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