In my dictionary, I have two sets of identical array values for different keys. My query is: How can I determine which keys have the same value based on inputting just one value? I want to retrieve all keys that share the same values as an output. This is important for my project where I can only use either sharp or flat, not both, in detecting a note.
var dictionary = {
"Cmaj7": ["C","E","G","B"] , //majors
"C#maj7": ["C#","F","G#","C"],
"Dbmaj7":["C#","F","G#","C"]}
Is this example similar to what you're looking for?
var dictionary = {
"Cmaj7": ["C","E","G","B"] , //majors
"C#maj7": ["C#","F","G#","C"],
"Dbmaj7":["C#","F","G#","C"]}
var newObj = {}
for (var o in dictionary) {
var reverseKey = dictionary[o].join("_");
if (!newObj[reverseKey]) newObj[reverseKey]=[];
newObj[reverseKey].push(o);
}
console.log(newObj)To solve this problem, you can utilize methods such as Array.filter, Array.every, Array.some, and Array.includes in the following manner:
var data = { "Cmaj7": ["C", "E", "G", "B"], "C#maj7": ["C#", "F", "G#", "C"], "Dbmaj7": ["C#", "F", "G#", "C"] }
const entries = Object.entries(data)
const duplicates = entries.filter(([key1, value1]) => value1.every(value => entries.some(([key2, value2]) => key1 != key2 && value2.includes(value))))
const output = duplicates.reduce((accumulator, [key, value]) => (accumulator[key] = value, accumulator), {})
console.log(output)The concept here is to extract the values of each key, filter them so that each value is present in the values of other keys in the object.
Alternatively, you can obtain an array of keys with similar values using Array.reduce and Array.filter:
var data = { "Cmaj7": ["C", "E", "G", "B"], "C#maj7": ["C#", "F", "G#", "C"], "Dbmaj7": ["C#", "F", "G#", "C"] }
const output = Object.entries(data).reduce((result, [key, value], index, array) => {
let combinedValue = value.join('-')
result[combinedValue] = [...result[combinedValue] || [], key]
return index == array.length-1 ? Object.values(result).filter(array => array.length > 1) : result
}, {})
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