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objects.js
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73 lines (64 loc) · 1.91 KB
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// Complete the following underscore functions.
// Reference http://underscorejs.org/ for examples.
const keys = (obj) => {
const props = Object.keys(obj);
return props;
// Retrieve all the names of the object's properties.
// Return the keys as strings in an array.
// Based on http://underscorejs.org/#keys
};
const values = (obj) => {
const valOfProp = Object.values(obj);
return valOfProp;
// Return all of the values of the object's own properties.
// Ignore functions
// http://underscorejs.org/#values
};
const mapObject = (obj, cb) => {
Object.keys(obj).forEach(key => (obj[key] = cb(obj[key])));
return obj;
// Like map for arrays, but for objects. Transform the value of each property in turn.
// http://underscorejs.org/#mapObject
};
const pairs = (obj) => {
const result = [];
// Object.keys(obj).forEach(key => (result.push[key, obj[key]]));
Object.keys(obj).forEach((key) => {
const pair = [key, obj[key]];
result.push(pair);
});
return result;
// Convert an object into a list of [key, value] pairs.
// http://underscorejs.org/#pairs
};
/* STRETCH PROBLEMS */
const invert = (obj) => {
const newObj = {};
Object.keys(obj).forEach((key) => {
newObj[obj[key]] = key;
});
return newObj;
// 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 defaults = (obj, defaultProps) => {
Object.keys(defaultProps).forEach((key) => {
if (obj[key] === undefined) {
obj[key] = defaultProps[key];
}
});
return obj;
// Fill in undefined properties that match properties on the `defaultProps` parameter object.
// Return `obj`.
// http://underscorejs.org/#defaults
};
/* eslint-enable no-unused-vars */
module.exports = {
keys,
values,
mapObject,
pairs,
invert,
defaults,
};