53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
/**
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* Credit: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/round
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*/
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var decimalAdjust = function(type, value, exp) {
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value = value || 0;
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exp = exp === undefined ? -2 : -Math.abs(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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// 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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var round = function(v, d) {
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return decimalAdjust('round', v, d);
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};
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module.exports = {
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round: round,
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floor: function(v, d) {
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return decimalAdjust('floor', v, d);
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},
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ceil: function(v, d) {
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return decimalAdjust('ceil', v, d);
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},
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equals: function(a, b, d) {
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return round(a, d) === round(b, d);
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},
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lessThan: function(a, b, d) {
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return round(a, d) < round(b, d);
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},
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lessThanOrEquals: function(a, b, d) {
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return round(a, d) <= round(b, d);
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},
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greaterThan: function(a, b, d) {
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return round(a, d) > round(b, d);
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},
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greaterThanOrEquals: function(a, b, d) {
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return round(a, d) >= round(b, d);
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}
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};
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