44 lines
879 B
Go
44 lines
879 B
Go
package main
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import (
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"time"
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)
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func SM2Next(ts time.Time, history []int, unit time.Duration) time.Time {
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n, ef, i := 0, 2.5, 1
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for j := range history {
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n, ef, i = sm2Next(history[j], n, ef, i)
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}
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return ts.Add(time.Duration(i) * unit)
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}
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// After all scheduled reviews are complete, SuperMemo asks the user to re-review any cards they marked with a grade less than 4 repeatedly until they give a grade ≥ 4.
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func sm2Next(thisGrade int, consecutivePassesBeforeThis int, efBefore float64, lastInterval int) (int, float64, int) {
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q := thisGrade
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n := consecutivePassesBeforeThis
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ef := efBefore
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i := lastInterval
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if q >= 3 {
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switch n {
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case 0:
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i = 1
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case 1:
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i = 6
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default:
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i = int(float64(i) * ef)
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}
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n += 1
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} else {
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n = 0
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i = 1
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}
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ef = ef + (.1 - (5.0-float64(q))*(.08+(5.0-float64(q))*.02))
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if ef < 1.3 {
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ef = 1.3
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}
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return n, ef, i
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}
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