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console.log("****************************************************"); |
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console.log("**** Working With Dollars & Cents in JavaScript ****"); |
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console.log("**** ~ The Definitive Guide ~ ****"); |
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console.log("****************************************************"); |
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console.log('\n'); |
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const formatAsDollarsAndCents = (value) => { |
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var newValue = parseFloat(value); |
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newValue = newValue.toFixed(2); |
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return newValue; |
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} |
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// Floating Point Numbers Formatted to 2 Decimal Places |
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console.log("Floating Point Numbers Formatted to 2 Decimal Places"); |
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const nonStandardAmountFormatted = formatAsDollarsAndCents(34.089999999999996); |
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console.log(nonStandardAmountFormatted); |
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const oneDecimalPlaceFormatted = formatAsDollarsAndCents(1.1); |
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console.log(oneDecimalPlaceFormatted); |
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const wholeNumberFormatted = formatAsDollarsAndCents(1); |
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console.log(wholeNumberFormatted); |
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console.log('\n'); |
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// Strings Formatted to 2 Decimal Places |
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console.log("Cast As String..."); |
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const nonStandardAmountFormattedAsString = nonStandardAmountFormatted.toString(); |
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console.log('$' + nonStandardAmountFormattedAsString); |
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const oneDecimalPlaceFormattedAsString = oneDecimalPlaceFormatted.toString(); |
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console.log('$' + oneDecimalPlaceFormattedAsString); |
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const wholeNumberFormattedAsString = wholeNumberFormatted.toString(); |
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console.log('$' + wholeNumberFormattedAsString); |
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console.log('\n'); |
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// Need to add commas? Here's the regex magic sprinkled in... |
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const myNumber = 1300000.89 |
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const myNumberAsString = myNumber.toString(); |
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const myNumberWithCommas = myNumberAsString.replace(/\d(?=(\d{3})+\.)/g, '$&,'); |
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console.log('Add commas... '); |
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console.log('$' + myNumberWithCommas); |
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// Edge case, need to add commas to a whole number? I've written a function that |
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// will add commas to a string of numeric characters. This is helpful when working |
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// with integers, as the regular expression above does not work with whole numbers. |
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// (One could write a regular expression that works with whole numbers, but I'm not |
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// very good with regex so I just wrote a function and moved on with my life 😉 |
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function getWholeNumberWithCommas(wholeNumberStr) { |
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// Step One, Reverse String |
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var reversedString = ""; |
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var indexOfLastChar = wholeNumberStr.length - 1; |
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for (var i = indexOfLastChar; i >= 0; i--) { |
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reversedString = reversedString + wholeNumberStr[i]; |
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} |
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// Step Two, Add Commas Every Third Char |
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var reversedStringWithCommas = ""; |
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for (var i = 0; i < reversedString.length; i++) { |
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// every third char, add a comma and the next char |
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if (i % 3 === 0 && i !== 0) { |
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reversedStringWithCommas = reversedStringWithCommas + "," + reversedString[i]; |
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} else { |
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reversedStringWithCommas = reversedStringWithCommas + reversedString[i]; |
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} |
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} |
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// Step Three, Reverse reversedStringWithCommas, and we'll have |
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// the whole number with commas that we want |
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var wholeNumberWithCommas = ""; |
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indexOfLastChar = reversedStringWithCommas.length - 1; |
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for (var i = indexOfLastChar; i >= 0; i--) { |
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wholeNumberWithCommas = wholeNumberWithCommas + reversedStringWithCommas[i]; |
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} |
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// Step Four, return wholeNumberWithCommas |
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return wholeNumberWithCommas; |
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} |
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console.log('\n'); |
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var testNumber = "9283749823749872398472938742983748"; |
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var testNumberWithCommas = getWholeNumberWithCommas(testNumber); |
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console.log('Add commas to a whole number (represented as a string)'); |
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console.log(testNumberWithCommas); |
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console.log('\n'); |
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console.log("****************************************************"); |
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console.log("****************************************************"); |
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console.log("****************************************************"); |
