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80 lines (72 loc) · 2.16 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
// commented out to try for...in
// const kys = keys(obj);
const vals = [];
const objkeys = Object.keys(obj);
for (let i = 0; i < objkeys.length; i++) {
vals.push(obj[objkeys[i]]);
}
return vals;
};
const mapObject = (obj, cb) => {
// Like map for arrays, but for objects. Transform the value of each property in turn.
// http://underscorejs.org/#mapObject
const trans = {};
const objkeys = Object.keys(obj);
for (let i = 0; i < objkeys.length; i++) {
trans[objkeys[i]] = cb(obj[objkeys[i]]);
}
return trans;
};
const pairs = (obj) => {
// Convert an object into a list of [key, value] pairs.
// http://underscorejs.org/#pairs
const pair = [];
const objkeys = Object.keys(obj);
for (let i = 0; i < objkeys.length; i++) {
pair.push([objkeys[i], obj[objkeys[i]]]);
}
return pair;
};
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 rev = {};
const objkeys = Object.keys(obj);
for (let i = 0; i < objkeys.length; i++) {
rev[obj[objkeys[i]]] = objkeys[i];
}
return rev;
};
const defaults = (obj, defaultProps) => {
// Fill in undefined properties that match properties on the `defaultProps` parameter object.
// Return `obj`.
// http://underscorejs.org/#defaults
const filled = obj;
const defKeys = Object.keys(defaultProps);
for (let i = 0; i < defKeys.length; i++) {
filled[defKeys[i]] = filled[defKeys[i]] || defaultProps[defKeys[i]];
}
return filled;
};
/* eslint-enable no-unused-vars */
module.exports = {
keys,
values,
mapObject,
pairs,
invert,
defaults
};