Welcome! This is the Altering the Constant in Javascript page of the MMINAIL.

The Altering the Constant in Javascript program renders a series of outputs to the console based on given unalterable constants and mutable variables from a hypothetical corporation.

Ok ... it's time to give this program a whirl!

Open up a new window in the Firefox browser.

Next, click on the 'open menu' aka the 'three horizontal bars' icon to the far right of the now un-populated 'enter an address' ( search ) bar.

Then, select the category 'Developer' . This will jump you to the Web Developer tool set Sub-menu.

Once at the Web Developer tool set Sub-menu, click on 'Web Console' to open up a code window.

There, you will see an input line at the bottom of the console.

You will now wish to go ahead and copy and paste our code into the program entry line at the bottom of the console.

Note. You can clear the Firefox Web-console by clicking on the Trash icon   at the top of the console.

Also, be sure to purge the browser memory prior to execution by re-setting ie.) re-loading the browser window.

Now, copy and paste our completed code from the given (.js) file into the program entry line at the bottom of the Firefox Web-console.

Then, hit the Enter key to place the program in the browser's memory.

Depending on the type of program being entered, there may be instantaneous execution, or there may be a pause.

If there is a pause, a second step that executes the program must be entered.

Note. In EcmaScript 5, we accommodate small screens in landscape mode when highlighting a code block through the use of the '\' back-slash key when seperating otherwise un-terminated string literals, as follows:

The program as is, written in Javascript ... with 'back-slashes'
//Set the constants
const TAX_RATE = 0.25;
/* where TAX_RATE is a decimal percentage */
const SHARES = 10000;
/* where the issued and outstanding SHARES \
are expressed in the number of voting units */
const DIV_RATE = 0.05;
/* where DIV_RATE is expressed in \
cents per share */

//Set the variables
var gr = 10000;
/* where gr = Gross Revenue */
var cgs = 4000;
/* where cgs = Cost of Goods Sold */
var oi = gr - cgs;
/* where oi = Operating Income */
var exp = 3500;
/* where exp = Expenses Paid */
var ti = oi - exp;
/* where ti = Taxable Income */
var ct = ti * TAX_RATE;
/* where ct = Corporate Tax */
var ni = ti - ct;
/* where ni = Net Income */
var eps = ni/SHARES;
/* where eps = Earnings Per Share */
var dp = SHARES * DIV_RATE;
/* where dp = Dividend Paid */
var re = ni - dp;
/* where re = Retained Earnings */

//Set and Flash Gross Revenue
console.log("gross revenue = " + gr);
let GR = "$" + String(gr.toFixed(2));
window.alert("The gross revenue received \
by your company for the tax year of \
2000 is " + GR + " USD");

//Set and Flash Cost of Goods Sold
console.log("cost of goods sold = " + cgs);
let CGS = "$" + String(cgs.toFixed(2));
window.alert("The cost of goods sold \
required to directly generate your gross \
revenue in the year 2000 is " + CGS + " USD");

//Set and Flash Operating Income
console.log("operating income = " + oi);
let OI = "$" + String(oi.toFixed(2));
window.alert("Therefore, the operating income \
generated by your company in the year \
2000 is " + OI + " USD");

//Set and Flash Expenses
console.log("expenses = " + exp);
let EXP = "$" + String(exp.toFixed(2));
window.alert("The expenses of your \
operation that are allowed to be \
indirectly deducted from your operating \
income subtotal are " + EXP + " USD");

//Set and Flash Taxable Income
console.log("taxable income = " + ti);
let TI = "$" + String(ti.toFixed(2));
window.alert("Your taxable income \
( Before Tax ) is therefore \
" + TI + " USD");

//Set and Flash Corporate Tax
console.log("corporate tax = " + ct);
let CT = "$" + String(ct.toFixed(2));
window.alert("Your corporate tax is \
based on a rate of " + TAX_RATE*100 \
+ "% of taxable income and is " \
+ CT + " USD for the tax year of 2000.");

//Set and Flash Net Income
console.log("net income = " + ni);
let NI = "$" + String(ni.toFixed(2));
window.alert("Your net income \
( After Tax ) is therefore " \
+ NI + " USD");

//Set and Flash Earnings Per Share
console.log("earnings per share = " + eps);
let EPS = "$" + String(eps.toFixed(4));
window.alert("Your earnings per share \
( Before Dividend Paid ) is " + EPS + " USD");

//Set and Flash Dividend Paid
console.log("dividend paid = " + dp);
let DP = "$" + String(dp.toFixed(2));
window.alert("Your aggregate dividend paid \
to shareholders is " + DP + " USD");

//Set and Flash Retained Earnings
console.log("retained earnings = " + re);
let RE = "$" + String(re.toFixed(2));
window.alert("Therefore, the aggregate \
amount of earnings per share retained \
by your company for future business use \
is " + RE + " USD");

//Set and Flash a Closing Line
window.alert("Thank you for engaging the \
'Altering the Constant' program. Please see \
the console log for a list of \
the results of your calculations.");
Time to execute!

Go ahead and follow the above Firefox Web-console Instructions to execute the program.

Now, that works fine. But, how will the code execute in Strict Mode? One way to find out is to transfer our code to a (.js) page and invoke Strict Mode at the top of the program.

Invoke Strict Mode ...
1
2
//Strict Objects
'use strict';

Place at the top of program.

Let's try that.

Transferring the above highlighted code block to a (.js) page ... Eliminating the back-slashes ...

Now, open up the (.js) file is a separate browser window and copy and paste the code into the Firefox Web-console. Then, hit Enter.

Looks good!

Though our program works fine in either traditional EcmaScript 5 safe mode, or in EcmaScript 6 strict mode ... something new is missing.

Namely, the use of `backticks` to accommodate the long window alerts with calls to locally declared, block scope variables, or let(s).

Let's replace those really long window alerts with multi-line Template Literals enclosed in `backticks` to see what happens.

More to come ...

Note. In EcmaScript 6, we accommodate small screens in landscape mode when highlighting a code block through the use of the '`' back-tick key when seperating otherwise un-terminated string literals, as follows:

The program as is, written in Javascript ... with 'back-ticks'
//Set the constants
const TAX_RATE = 0.25;
/* where TAX_RATE is a decimal percentage */
const SHARES = 10000;
/* where the issued and outstanding SHARES 
are expressed in the number of voting units */
const DIV_RATE = 0.05;
/* where DIV_RATE is expressed in 
cents per share */

//Set the variables
var gr = 10000;
/* where gr = Gross Revenue */
var cgs = 4000;
/* where cgs = Cost of Goods Sold */
var oi = gr - cgs;
/* where oi = Operating Income */
var exp = 3500;
/* where exp = Expenses Paid */
var ti = oi - exp;
/* where ti = Taxable Income */
var ct = ti * TAX_RATE;
/* where ct = Corporate Tax */
var ni = ti - ct;
/* where ni = Net Income */
var eps = ni/SHARES;
/* where eps = Earnings Per Share */
var dp = SHARES * DIV_RATE;
/* where dp = Dividend Paid */
var re = ni - dp;
/* where re = Retained Earnings */

//Set and Flash Gross Revenue
console.log("gross revenue = " + gr);
let GR = "$" + String(gr.toFixed(2));
window.alert("The gross revenue received \
by your company for the tax year of #2000 \
is " + GR + " USD");

//Set and Flash Cost of Goods Sold
console.log("cost of goods sold = " + cgs);
let CGS = "$" + String(cgs.toFixed(2));
window.alert("The cost of goods sold \
required to directly generate your gross \
revenue in the year 2000 is " + CGS + " USD");

//Set and Flash Operating Income
console.log("operating income = " + oi);
let OI = "$" + String(oi.toFixed(2));
window.alert("Therefore, the operating income \
generated by your company in the year #2000 \
is " + OI + " USD");

//Set and Flash Expenses
console.log("expenses = " + exp);
let EXP = "$" + String(exp.toFixed(2));
window.alert("The expenses of your \
operation that are allowed to be \
indirectly deducted from your operating \
income subtotal are " + EXP + " USD");

//Set and Flash Taxable Income
console.log("taxable income = " + ti);
let TI = "$" + String(ti.toFixed(2));
window.alert("Your taxable income \
( Before Tax ) is therefore \
" + TI + " USD");

//Set and Flash Corporate Tax
console.log("corporate tax = " + ct);
let CT = "$" + String(ct.toFixed(2));
window.alert("Your corporate tax is \
based on a rate of " + TAX_RATE*100 \
+ "% of taxable income and is " \
+ CT + " USD for the tax year of 2000.");

//Set and Flash Net Income
console.log("net income = " + ni);
let NI = "$" + String(ni.toFixed(2));
window.alert("Your net income \
( After Tax ) is therefore " \
+ NI + " USD");

//Set and Flash Earnings Per Share
console.log("earnings per share = " + eps);
let EPS = "$" + String(eps.toFixed(4));
window.alert("Your earnings per share \
( Before Dividend Paid ) is " + EPS + " USD");

//Set and Flash Dividend Paid
console.log("dividend paid = " + dp);
let DP = "$" + String(dp.toFixed(2));
window.alert("Your aggregate dividend paid \
to shareholders is " + DP + " USD");

//Set and Flash Retained Earnings
console.log("retained earnings = " + re);
let RE = "$" + String(re.toFixed(2));
window.alert("Therefore, the aggregate \
amount of earnings per share retained \
by your company for future business use \
is " + RE + " USD");

//Set and Flash a Closing Line
window.alert("Thank you for engaging the \
'Altering the Constant' program. Please see \
the console log for a list of \
the results of your calculations.");
Time to execute!

Go ahead and follow the above Firefox Web-console Instructions to execute the program.

    Finito!