JSC

I want to post a few personal how 2's
that belong to the webkit way of doing things

JSC

javascript core how to

Run JavaScript jsc from the command line in Linux
tested on the raspberry pi3

Dependency
1.) Get the javascript engine for gtk3 and webkit
that is if you are using a debian based system

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sudo apt-get install libjavascriptcoregtk-3.0-bin 

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Official Documentation

man jsc

and https://trac.webkit.org/wiki/JSC

I ported an example from node syntax to jsc syntax
https://www.pcsuggest.com/run-javascript-from-command-line-linux/

jsc is a wild non conformant creature

notice
The way you pass arguments prefixed with -- then the args

usually argv 0 is the command
then argv 1 is the name of the script
then argv 2 and more passed to the functions
that is a set standard

notice
JRC breaks all those rules !
jrc arg 0 = argv[2] standard array syntax
jrc arg 1 = argv[3] standard array syntax

Lets get to the code

# NODE:
A very simple BMI calculator in javascript, not fault tolerant

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var mass = +process.argv[2];
var height = +process.argv[3];
BMI = mass / Math.pow(height, 2);
console.log(BMI);

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it expects you pass 2 arguments
weight in kilos and height in meters

JSC:

This is my port of the node example using jsc

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var mass = arguments[0];
var height =  arguments[1];
BMI = mass / Math.pow(height, 2);

//debug  alias PRINT to console 
debug(BMI);

---

I added some comments and a test to
check if you passed arguments

now in the linux terminal run

jsc bmi_calc.js  -- 95 1.92

---

name this code below bmi_calc.js
bmi_calc download it

//--------------------------------------------
// bmi_calc.js  -- 95 1.92
//--------------------------------------------

// argument 0 is  95
// argument 1 is  1.92


// added a test if arguments were passed 
if (!arguments[0]) {
   print('usage:\n # jsc bmi_calc.js  -- 1 2');
   quit();
}



var mass = arguments[0];
var height =  arguments[1];
BMI = mass / Math.pow(height, 2);

//debug  alias PRINT to console 
debug(BMI);
debug(arguments[0]);
debug(arguments[1]);

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if you want to see the code side by side

---

NODE	JSC
var mass = +process.argv[2];	var mass = arguments[0];
var height = +process.argv[3];	var height = arguments[1];
BMI = mass / Math.pow(height, 2);	BMI = mass / Math.pow(height, 2);
console.log(BMI);	debug(BMI);