From 9ce24977658f22bd5492cde27101b79f00394def Mon Sep 17 00:00:00 2001 From: 30secondsofcode <30secondsofcode@gmail.com> Date: Wed, 14 Feb 2018 10:48:38 +0000 Subject: [PATCH] Travis build: 1671 --- README.md | 24 ++++++++++++++++++++++++ docs/index.html | 6 ++++-- snippets/approximatelyEqual.md | 2 +- 3 files changed, 29 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 0b99c993a..5194f20c3 100644 --- a/README.md +++ b/README.md @@ -258,6 +258,7 @@ average(1, 2, 3);
View contents +* [`approximatelyEqual`](#approximatelyequal) * [`average`](#average) * [`averageBy`](#averageby) * [`binomialCoefficient`](#binomialcoefficient) @@ -4314,6 +4315,29 @@ unfold(f, 10); // [-10, -20, -30, -40, -50] --- ## ➗ Math +### approximatelyEqual + +Checks if two numbers are approximately equal to each other. + +Use `Math.abs()` to compare the absolute difference of the two values to `epsilon`. +Omit the third parameter, `epsilon`, to use a default value of `0.001`. + +```js +const approximatelyEqual = (v1, v2, epsilon = 0.001) => Math.abs(v1 - v2) < epsilon; +``` + +
+Examples + +```js +approximatelyEqual(Math.PI / 2.0, 1.5708); // true +``` + +
+ +
[⬆ Back to top](#table-of-contents) + + ### average Returns the average of two or more numbers. diff --git a/docs/index.html b/docs/index.html index 45e2c52bc..75890c2f5 100644 --- a/docs/index.html +++ b/docs/index.html @@ -50,7 +50,7 @@ scrollToTop(); } }, false); - }

logo 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.

 

Adapter

ary

Creates a function that accepts up to n arguments, ignoring any additional arguments.

Call the provided function, fn, with up to n arguments, using Array.slice(0,n) and the spread operator (...).

const ary = (fn, n) => (...args) => fn(...args.slice(0, n));
+      }
logo 30 seconds of code Curated collection of useful JavaScript snippets that you can understand in 30 seconds or less.
 
Adapter
ary
Creates a function that accepts up to n arguments, ignoring any additional arguments.
Call the provided function, fn, with up to n arguments, using Array.slice(0,n) and the spread operator (...).
const ary = (fn, n) => (...args) => fn(...args.slice(0, n));
 
const firstTwoMax = ary(Math.max, 2);
 [[2, 6, 'a'], [8, 4, 6], [10]].map(x => firstTwoMax(...x)); // [6, 8, 10]
 
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
Use a closure to call a stored key with stored arguments.
const call = (key, ...args) => context => context[key](...args);
@@ -989,7 +989,9 @@ console.log<
 };
 
var f = n => (n > 50 ? false : [-n, n + 10]);
 unfold(f, 10); // [-10, -20, -30, -40, -50]
-
Math
average
Returns the average of two or more numbers.
Use Array.reduce() to add each value to an accumulator, initialized with a value of 0, divide by the length of the array.
const average = (...nums) => [...nums].reduce((acc, val) => acc + val, 0) / nums.length;
+
Math
approximatelyEqual
Checks if two numbers are approximately equal to each other.
Use Math.abs() to compare the absolute difference of the two values to epsilon. Omit the third parameter, epsilon, to use a default value of 0.001.
const approximatelyEqual = (v1, v2, epsilon = 0.001) => Math.abs(v1 - v2) < epsilon;
+
approximatelyEqual(Math.PI / 2.0, 1.5708); // true
+
average
Returns the average of two or more numbers.
Use Array.reduce() to add each value to an accumulator, initialized with a value of 0, divide by the length of the array.
const average = (...nums) => [...nums].reduce((acc, val) => acc + val, 0) / nums.length;
 
average(...[1, 2, 3]); // 2
 average(1, 2, 3); // 2
 
averageBy
Returns the average of an array, after mapping each element to a value using the provided function.
Use Array.map() to map each element to the value returned by fn, Array.reduce() to add each value to an accumulator, initialized with a value of 0, divide by the length of the array.
const averageBy = (arr, fn) =>
diff --git a/snippets/approximatelyEqual.md b/snippets/approximatelyEqual.md
index e93864536..88773c163 100644
--- a/snippets/approximatelyEqual.md
+++ b/snippets/approximatelyEqual.md
@@ -10,5 +10,5 @@ const approximatelyEqual = (v1, v2, epsilon = 0.001) => Math.abs(v1 - v2) < epsi
 ```
 
 ```js
-approximatelyEqual(Math.PI / 2.0 , 1.5708); // true
+approximatelyEqual(Math.PI / 2.0, 1.5708); // true
 ```