47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
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import assert from 'assert'
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export const epsilon = 1e-12
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const isNumber = entity => (typeof entity === 'number')
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export function equal(a, b) {
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if (isNumber(a) && isNumber(b)) {
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if (a === b) return true
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if (isNaN(a)) return assert.strictEqual(a.toString(), b.toString())
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const message = `${a} ~= ${b} (to ${epsilon})`
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if (a === 0) return assert.ok(Math.abs(b) < epsilon, message)
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if (b === 0) return assert.ok(Math.abs(a) < epsilon, message)
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const diff = Math.abs(a - b)
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const maxDiff = Math.abs(epsilon * Math.max(Math.abs(a), Math.abs(b)))
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return assert.ok(diff <= maxDiff, message)
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}
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return assert.strictEqual(a, b)
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}
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export function deepEqual(a, b) {
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if (Array.isArray(a) && Array.isArray(b)) {
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const alen = a.length
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assert.strictEqual(alen, b.length, `${a} ~= ${b}`)
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for (let i = 0; i < alen; ++i) deepEqual(a[i], b[i])
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return true
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}
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if (typeof a === 'object' && typeof b === 'object') {
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for (const prop in a) {
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if (a.hasOwnProperty(prop)) {
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assert.ok(
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b.hasOwnProperty(prop), `a[${prop}] = ${a[prop]} ~= ${b[prop]}`)
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deepEqual(a[prop], b[prop])
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}
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}
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for (const prop in b) {
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if (b.hasOwnProperty(prop)) {
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assert.ok(
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a.hasOwnProperty(prop), `${a[prop]} ~= ${b[prop]} = b[${prop}]`)
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}
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}
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return true
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}
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return equal(a, b)
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}
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