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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | // takes a function that evaluates to true or false and static if and else responses. return function that evaluates condition and returns appropriate response
export function showIfElse (condition, a, b = []) {
return () => condition() ? a : b
}
// takes an object and a mapping-function. returns a function that maps the object through the function and returns previously calculated mappings on future calls
export function mapEntries (object, f) {
const map = new Map()
return () => {
const o = (typeof object === 'function' ? object() : object) || {}
map.forEach(indexedValues => {
indexedValues.index = 0
})
const mappedEntries = Object.entries(o).map(([name, value]) => {
if (!map.has(value)) {
map.set(value, { index: 0, values: [] })
}
const indexedValues = map.get(value)
if (indexedValues.values.length <= indexedValues.index) {
indexedValues.values.push(f(value, name))
}
return indexedValues.values[indexedValues.index++]
})
// cleanup any unmapped-to values
map.forEach((indexedValues, key) => {
if (indexedValues.index) {
indexedValues.values.splice(indexedValues.index)
} else {
map.delete(key)
}
})
return mappedEntries
}
}
export function mapSwitch (expression, f) {
const map = new Map()
return () => {
const expr = expression()
if (!map.has(expr)) {
map.set(expr, f(expr))
}
return map.get(expr)
}
}
export function objToDeclarations (obj = {}) {
return Object.entries(obj).map(([name, value]) => `${name}: ${value};`).join('')
}
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