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// Merges an array of objects into a single object.
// The second argument allows for an array of property names who's object values will be merged together.
export function mergeProps(propObjs, complexProps?): any {
let dest = {}
let i
let name
let complexObjs
let j
let val
let props
if (complexProps) {
for (i = 0; i < complexProps.length; i++) {
name = complexProps[i]
complexObjs = []
// collect the trailing object values, stopping when a non-object is discovered
for (j = propObjs.length - 1; j >= 0; j--) {
val = propObjs[j][name]
if (typeof val === 'object' && val) { // non-null object
complexObjs.unshift(val)
} else if (val !== undefined) {
dest[name] = val // if there were no objects, this value will be used
break
}
}
// if the trailing values were objects, use the merged value
if (complexObjs.length) {
dest[name] = mergeProps(complexObjs)
}
}
}
// copy values into the destination, going from last to first
for (i = propObjs.length - 1; i >= 0; i--) {
props = propObjs[i]
for (name in props) {
if (!(name in dest)) { // if already assigned by previous props or complex props, don't reassign
dest[name] = props[name]
}
}
}
return dest
}
export function filterHash(hash, func) {
let filtered = {}
for (let key in hash) {
if (func(hash[key], key)) {
filtered[key] = hash[key]
}
}
return filtered
}
export function mapHash<InputItem, OutputItem>(
hash: { [key: string]: InputItem },
func: (input: InputItem, key: string) => OutputItem
): { [key: string]: OutputItem } {
let newHash = {}
for (let key in hash) {
newHash[key] = func(hash[key], key)
}
return newHash
}
export function arrayToHash(a): { [key: string]: true } {
let hash = {}
for (let item of a) {
hash[item] = true
}
return hash
}
export function hashValuesToArray(obj) {
let a = []
for (let key in obj) {
a.push(obj[key])
}
return a
}