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export function isNotNull<T>(a: T | null): a is T {
return a !== null
}
export function isNotUndefined<T>(a: T | undefined): a is T {
return a !== undefined
}
export function isNotNullOrUndefined<T>(a: T | null): a is T {
return a !== null && a !== undefined
}
export const joinObjects = <T extends {}>(
list: T[],
separator: (prev: T, next: T) => T,
): T[] => {
const result = []
for (let i = 0; i < list.length; i++) {
result.push(list[i])
if (i < list.length - 1) {
result.push(separator(list[i], list[i + 1]))
}
}
return result
}
export const closedRange = (start: number, end: number, step: number) => {
const result = []
for (let i = start; i <= end; i += step) {
result.push(i)
}
return result
}
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