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objects.js
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83 lines (74 loc) · 2.34 KB
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// Complete the following underscore functions.
// Reference http://underscorejs.org/ for examples.
const keys = (obj) => {
// Retrieve all the names of the object's properties.
// Return the keys as strings in an array.
// Based on http://underscorejs.org/#keys
return Object.keys(obj);
};
const values = (obj) => {
// Return all of the values of the object's own properties.
// Ignore functions
// http://underscorejs.org/#values
return Object.values(obj);
};
const mapObject = (obj, cb) => {
// Like map for arrays, but for objects. Transform the value of each property in turn.
// http://underscorejs.org/#mapObject
const objectKeys = Object.keys(obj);
for (let i = 0; i < objectKeys.length; i++) {
obj[objectKeys[i]] = cb(obj[objectKeys[i]]);
}
return obj;
};
const pairs = (obj) => {
// Convert an object into a list of [key, value] pairs.
// http://underscorejs.org/#pairs
const newArray = [];
const objectKeys = Object.keys(obj);
const objectValues = Object.values(obj);
for (let x = 0; x < objectKeys.length; x++) {
newArray.push([objectKeys[x], objectValues[x]]);
// pair.push(objKeys[i], objValues[i]);
// arrOfPairs.push(pair);
// pair = [];
// [ ['string1, 'string2']]
}
return newArray;
};
/* STRETCH PROBLEMS */
const invert = (obj) => {
// Returns a copy of the object where the keys have become the values and the values the keys.
// Assume that all of the object's values will be unique and string serializable.
// http://underscorejs.org/#invert
const newObject = {};
const objectKeys = Object.keys(obj);
const objectValues = Object.values(obj);
for (let i = 0; i < objectKeys.length; i++) {
newObject[objectValues[i]] = objectKeys[i];
}
return newObject;
};
const defaults = (obj, defaultProps) => {
// Fill in undefined properties that match properties on the `defaultProps` parameter object.
// Return `obj`.
// http://underscorejs.org/#defaults
const defaultKeys = Object.keys(defaultProps);
const defaultValues = Object.values(defaultProps);
const objKey = Object.keys(obj);
for (let i = 0; i < defaultKeys.length; i++) {
if (obj[defaultKeys[i]] === undefined) {
obj[defaultKeys[i]] = defaultValues[i];
}
}
return obj;
};
/* eslint-enable no-unused-vars */
module.exports = {
keys,
values,
mapObject,
pairs,
invert,
defaults,
};