File size: 2,072 Bytes
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"use strict";
var testCases = new Map();
testCases.set(0, "$0.00");
testCases.set(.10, "$0.10");
testCases.set(.01, "$0.01");
testCases.set(1000000000000.00, "$1,000,000,000,000.00");
testCases.set(10.00, "$10.00");
testCases.set(-.10, "-$0.10");
testCases.set("Million bucks", "<invalid>");
testCases.set(3216848.45, "$3,216,848.45");
testCases.set("3216848.45", "$3,216,848.45");
var failures = false;
for(var [testcase, result] of testCases) {
var thisRes = renderAmt(testcase);
if(thisRes !== result) {
failures = true;
console.log("----FAIL: renderAmt(" + testcase + ") returned " + thisRes + ", expected " + result);
} else {
console.log("----PASS: renderAmt(" + testcase + ") == " + thisRes);
}
}
if(!failures) {
console.log("All tests have passed 🍺");
}
function renderAmt(expamount) {
if(!isNumeric(expamount)){
return "<invalid>";
}
var neg = false;
if(expamount < 0) {
expamount *= (-1);
neg = true;
}
var cents_num = expamount - Math.floor(expamount);
if(cents_num == 0) {
var cents = '00';
} else {
var cents_arr = (expamount + '').split('.');
var cents = cents_arr[1];
if(cents.length < 2){
cents = cents + "0";
}
}
var amt_str = '';
var amt = Math.floor(expamount);
var dgcount = 0; // digit group count
var quot = Math.floor(amt/10);
var rem = amt%10;
amt = quot;
amt_str = rem + amt_str;
dgcount++;
while(quot > 0) {
quot = Math.floor(amt/10);
rem = amt%10;
amt = quot;
if(dgcount >= 3) {
amt_str = rem + ',' + amt_str;
dgcount = 0;
} else {
amt_str = rem + amt_str;
}
dgcount++;
}
if(neg) {
amt_str = '-$' + amt_str + '.' + cents;
} else {
amt_str = '$' + amt_str + '.' + cents;
}
return amt_str;
}
// via https://goo.gl/WTbW5g
function isNumeric(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}
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