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17 lines
707 B
TypeScript
17 lines
707 B
TypeScript
// Indexes into demo-data arrays (people.json, photos.json, …) that pages trust to have
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// an entry at a given position. Throws instead of silently rendering `undefined` if that
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// assumption is ever violated (e.g. a seed file shrinks).
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export function requireIndex<T>(array: readonly T[], index: number): T {
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const item = array[index]
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if (item === undefined) {
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throw new Error(`Expected an entry at index ${index}, got undefined (array has ${array.length} entries)`)
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}
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return item
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}
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/** Inclusive integer range [from, to]; empty when from > to. */
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export function range(from: number, to: number): number[] {
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return Array.from({ length: Math.max(0, to - from + 1) }, (_, i) => from + i)
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}
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