petitPapillon
8 years ago
9 changed files with 97 additions and 83 deletions
@ -1,52 +1,24 @@ |
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// ref: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Math/round#Decimal_rounding
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export function formatValue(formatType, formatValue, formatExp) { |
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let _formatExp; |
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/** |
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* Decimal adjustment of a number. |
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* |
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* @param {String} type The type of adjustment. |
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* @param {Number} value The number. |
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* @param {Integer} exp The exponent (the 10 logarithm of the adjustment base). |
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* @returns {Number} The adjusted value. |
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*/ |
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function decimalAdjust(type, value, exp) { |
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// If the exp is undefined or zero...
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if (typeof exp === 'undefined' || +exp === 0) { |
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return Math[type](value); |
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} |
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value = +value; |
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exp = +exp; |
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// If the value is not a number or the exp is not an integer...
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if (isNaN(value) || !(typeof exp === 'number' && exp % 1 === 0)) { |
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return NaN; |
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} |
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// If the value is negative...
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if (value < 0) { |
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return -decimalAdjust(type, -value, exp); |
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} |
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// Shift
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value = value.toString().split('e'); |
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value = Math[type](+(value[0] + 'e' + (value[1] ? (+value[1] - exp) : -exp))); |
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// Shift back
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value = value.toString().split('e'); |
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return +(value[0] + 'e' + (value[1] ? (+value[1] + exp) : exp)); |
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} |
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// display rounding
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export function formatValue(formatValue) { |
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const _valueToStr = formatValue.toString(); |
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if (Math.abs(Number(formatValue)) >= 1) { |
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_formatExp = -3; |
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if (_valueToStr.indexOf('.') === -1) { |
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return formatValue; |
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} else { |
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_formatExp = formatExp; |
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} |
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if (_valueToStr) { |
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const _decimal = _valueToStr.substr(_valueToStr.indexOf('.') + 1, _valueToStr.length); |
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let newVal = _valueToStr.substr(0, _valueToStr.indexOf('.') + 1); |
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for (let i = 0; i < _decimal.length; i++) { |
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if (_decimal[i] === '0') { |
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newVal = newVal + _decimal[i]; |
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} else { |
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newVal = newVal + _decimal[i]; |
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break; |
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} |
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} |
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switch (formatType) { |
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case 'round': |
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return decimalAdjust('round', formatValue, _formatExp); |
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break; |
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case 'floor': |
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return decimalAdjust('floor', formatValue, _formatExp); |
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break; |
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case 'ceil': |
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return decimalAdjust('ceil', formatValue, _formatExp); |
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break; |
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return newVal; |
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} |
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} |
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} |
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