127 lines
2.6 KiB
JavaScript
127 lines
2.6 KiB
JavaScript
import Equation from './index';
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/*
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* Operators and Functions
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* fn: function used to evaluate value
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* format: the format using which arguments are parsed:
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* 0 indicates an argument and 1 indicates the operator
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* e.g: factorial is 01, add is 010, like 2!, 2+2
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* precedence: determines which operators should be evaluated first
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* the lower the value, the higher the precedence
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* hasExpression: determines if any of the operator arguments are an expression
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* This way, arguments will not be solved by equation and instead
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* you have to call solve on each argument yourself.
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* You get the arguments as parsed arrays sigma(0, 5, 2@) becomes
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* sigma(0, 5, [2, '*', '@']). See sigma operator for reference
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*/
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export default {
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'^': {
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fn: (a, b) => Math.pow(a, b),
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format: '010',
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precedence: 0
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},
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'*': {
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fn: (a, b) => a * b,
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format: '010',
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precedence: 1
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},
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'/': {
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fn: (a, b) => a / b,
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format: '010',
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precedence: 1
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},
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'%': {
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fn: (a, b) => a % b,
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format: '010',
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precedence: 1
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},
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'\\': {
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fn: (a, b) => Math.floor(a / b),
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format: '010',
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precedence: 1
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},
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'+': {
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fn: (a, b) => a + b,
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format: '010',
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precedence: 2
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},
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'-': {
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fn: (a, b) => a - b,
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format: '010',
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precedence: 2
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},
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'!': {
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fn: (a) => {
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let sum = 1;
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for (var i = 1; i <= a; ++i) {
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sum *= i;
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}
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return sum;
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},
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format: '01',
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precedence: 2
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},
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'log': {
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fn: Math.log,
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format: '10',
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precedence: -1
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},
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'ln': {
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fn: Math.log,
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format: '10',
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precedence: -1
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},
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'lg': {
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fn: (a) => Math.log(a) / Math.log(2),
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format: '10',
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precedence: -1
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},
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'sin': {
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fn: Math.sin,
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format: '10',
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precedence: -1
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},
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'cos': {
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fn: Math.cos,
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format: '10',
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precedence: -1
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},
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'tan': {
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fn: Math.tan,
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format: '10',
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precedence: -1
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},
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'cot': {
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fn: Math.cot,
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format: '10',
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precedence: -1
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},
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'round': {
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fn: Math.round,
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format: '10',
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precedence: -1
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},
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'floor': {
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fn: Math.floor,
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format: '10',
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precedence: -1
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},
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'sigma': {
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fn(from, to, expression) {
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const expr = expression.join('').replace(/,/g, '');
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const regex = new RegExp(ITERATOR_SIGN, 'g');
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let sum = 0;
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for (let i = from; i <= to; i++) {
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sum += Equation.solve(expr.replace(regex, i));
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}
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return sum;
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},
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format: '1000',
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hasExpression: true,
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precedence: -1
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}
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};
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const ITERATOR_SIGN = '@';
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