// (to: Object, ...sources: Object[]) => Object
function mergeDeep(to) {
const sources = Array.from(arguments).slice(1)
// (to: Object, from: Object) => void
const _merge = (to, from) => {
for (let _ in from) {
if (_ in to) {
_merge(to[_], from[_])
} else {
to[_] = from[_]
}
}
}
sources.forEach(from => {
_merge(to, from)
})
return to
}
var us1 = {
country: {
"United States": {
"Ford": {
"engine": {
type1: "4 cyl",
type2: "6 cyl"
}
},
"Chevy": {
"engine": {
type1: "6 cyl"
}
}
}
}
}
var us2 = {
country: {
"United States": {
"Ford": {
"engine": {
type3: "12 cyl"
}
},
"Saturn": {
"engine": {
type1: "4 cyl"
}
}
}
}
}
const assert = require('assert')
assert.deepEqual(mergeDeep(us1, us2), {
country: {
"United States": {
"Ford": {
"engine": {
type1: "4 cyl",
type2: "6 cyl",
type3: "12 cyl"
}
},
"Chevy": {
"engine": {
type1: "6 cyl"
}
},
"Saturn": {
"engine": {
type1: "4 cyl"
}
}
}
}
})
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