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Fix code inconsistencies and redundancy in util/Collections.js. (#1884)

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* Normalize undefined type checks in collections with typeof operators.

* Remove redundant number type checking in collections.

Number.isInteger() throws false for strings and any other types that aren't numbers.
This commit is contained in:
Cynthia Lin
2017-09-04 08:45:58 -07:00
committed by Crawl
parent 2e4de62ddf
commit 3a503ef56e
1 changed files with 7 additions and 13 deletions
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20
src/util/Collection.js
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@@ -64,8 +64,7 @@ class Collection extends Map {
* @returns {*|Array<*>} The single value if `count` is undefined, or an array of values of `count` length
*/
first(count) {
if (count === undefined) return this.values().next().value;
if (typeof count !== 'number') throw new TypeError('The count must be a number.');
if (typeof count === 'undefined') return this.values().next().value;
if (!Number.isInteger(count) || count < 1) throw new RangeError('The count must be an integer greater than 0.');
count = Math.min(this.size, count);
const arr = new Array(count);
@@ -80,8 +79,7 @@ class Collection extends Map {
* @returns {*|Array<*>} The single key if `count` is undefined, or an array of keys of `count` length
*/
firstKey(count) {
if (count === undefined) return this.keys().next().value;
if (typeof count !== 'number') throw new TypeError('The count must be a number.');
if (typeof count === 'undefined') return this.keys().next().value;
if (!Number.isInteger(count) || count < 1) throw new RangeError('The count must be an integer greater than 0.');
count = Math.min(this.size, count);
const arr = new Array(count);
@@ -98,8 +96,7 @@ class Collection extends Map {
*/
last(count) {
const arr = this.array();
if (count === undefined) return arr[arr.length - 1];
if (typeof count !== 'number') throw new TypeError('The count must be a number.');
if (typeof count === 'undefined') return arr[arr.length - 1];
if (!Number.isInteger(count) || count < 1) throw new RangeError('The count must be an integer greater than 0.');
return arr.slice(-count);
}
@@ -112,8 +109,7 @@ class Collection extends Map {
*/
lastKey(count) {
const arr = this.keyArray();
if (count === undefined) return arr[arr.length - 1];
if (typeof count !== 'number') throw new TypeError('The count must be a number.');
if (typeof count === 'undefined') return arr[arr.length - 1];
if (!Number.isInteger(count) || count < 1) throw new RangeError('The count must be an integer greater than 0.');
return arr.slice(-count);
}
@@ -126,8 +122,7 @@ class Collection extends Map {
*/
random(count) {
let arr = this.array();
if (count === undefined) return arr[Math.floor(Math.random() * arr.length)];
if (typeof count !== 'number') throw new TypeError('The count must be a number.');
if (typeof count === 'undefined') return arr[Math.floor(Math.random() * arr.length)];
if (!Number.isInteger(count) || count < 1) throw new RangeError('The count must be an integer greater than 0.');
if (arr.length === 0) return [];
const rand = new Array(count);
@@ -144,8 +139,7 @@ class Collection extends Map {
*/
randomKey(count) {
let arr = this.keyArray();
if (count === undefined) return arr[Math.floor(Math.random() * arr.length)];
if (typeof count !== 'number') throw new TypeError('The count must be a number.');
if (typeof count === 'undefined') return arr[Math.floor(Math.random() * arr.length)];
if (!Number.isInteger(count) || count < 1) throw new RangeError('The count must be an integer greater than 0.');
if (arr.length === 0) return [];
const rand = new Array(count);
@@ -248,7 +242,7 @@ class Collection extends Map {
* if (collection.exists('username', 'Bob')) {
* console.log('user here!');
* }
* @example
* @example
* if (collection.exists(user => user.username === 'Bob')) {
* console.log('user here!');
* }