79 lines
2.3 KiB
TypeScript
79 lines
2.3 KiB
TypeScript
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/**
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* @desc 解决浮动运算问题，避免小数点后产生多位数和计算精度损失。
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*
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* 问题示例：2.3 + 2.4 = 4.699999999999999，1.0 - 0.9 = 0.09999999999999998
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*/
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declare type NumberType = number | string;
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/**
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* Correct the given number to specifying significant digits.
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*
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* @param num The input number
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* @param precision An integer specifying the number of significant digits
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*
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* @example strip(0.09999999999999998) === 0.1 // true
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*/
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declare function strip(num: NumberType, precision?: number): number;
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/**
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* Return digits length of a number.
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*
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* @param num The input number
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*/
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declare function digitLength(num: NumberType): number;
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/**
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* Convert the given number to integer, support scientific notation.
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* The number will be scale up if it is decimal.
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*
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* @param num The input number
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*/
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declare function float2Fixed(num: NumberType): number;
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/**
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* Accurate multiplication.
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*
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* @param nums The numbers to multiply
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*/
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declare const times: (...nums: NumberType[]) => number;
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/**
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* Accurate addition.
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*
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* @param nums The numbers to add
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*/
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declare const plus: (...nums: NumberType[]) => number;
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/**
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* Accurate subtraction.
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*
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* @param nums The numbers to subtract
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*/
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declare const minus: (...nums: NumberType[]) => number;
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/**
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* Accurate division.
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*
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* @param nums The numbers to divide
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*/
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declare const divide: (...nums: NumberType[]) => number;
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/**
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* Accurate rounding method.
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*
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* @param num The number to round
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* @param decimal An integer specifying the decimal digits
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*/
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declare function round(num: NumberType, decimal: number): number;
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/**
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* Whether to check the bounds of number, default is enabled.
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*
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* @param flag The value to indicate whether is enabled
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*/
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declare function enableBoundaryChecking(flag?: boolean): void;
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export { strip, plus, minus, times, divide, round, digitLength, float2Fixed, enableBoundaryChecking };
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declare const _default: {
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strip: typeof strip;
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plus: (...nums: NumberType[]) => number;
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minus: (...nums: NumberType[]) => number;
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times: (...nums: NumberType[]) => number;
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divide: (...nums: NumberType[]) => number;
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round: typeof round;
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digitLength: typeof digitLength;
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float2Fixed: typeof float2Fixed;
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enableBoundaryChecking: typeof enableBoundaryChecking;
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};
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export default _default;
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