30 lines
884 B
JavaScript
30 lines
884 B
JavaScript
import typed from 'typed-function'
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/* Use a plain object with keys re and im for a complex; note the components
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* can be any type (for this proof-of-concept; in reality we'd want to
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* insist on some numeric or scalar supertype).
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*/
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export function isComplex(z) {
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return z && typeof z === 'object' && 're' in z && 'im' in z
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}
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typed.addType({name: 'Complex', test: isComplex})
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typed.addConversion({
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from: 'number',
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to: 'Complex',
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convert: x => ({re: x, im: 0})
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})
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/* Pleasantly enough, it is OK to add this conversion even if there is no
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* type 'bigint' defined, so everything should Just Work.
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*/
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typed.addConversion({
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from: 'bigint',
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to: 'Complex',
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convert: x => ({re: x, im: 0n})
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})
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/* test if an entity is Complex<number>, so to speak: */
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export function numComplex(z) {
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return isComplex(z) && typeof z.re === 'number' && typeof z.im === 'number'
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}
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