Adapter
call
Given a key and a set of arguments, call them when given a context. Primarily useful in composition.
@@ -277,6 +275,18 @@ b = {} Object.assign(b, a) // == b */ +pipeFunctions
Performs left-to-right function composition.
+Use Array.reduce() with the spread operator (...) to perform left-to-right function composition.
+The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.
const pipeFunctions = (...fns) => fns.reduce((f, g) => (...args) => g(f(...args)));
+/*
+const add5 = x => x + 5
+const multiply = (x, y) => x * y
+const multiplyAndAdd5 = pipeFunctions(multiply, add5)
+multiplyAndAdd5(5, 2) -> 15
+*/
+promisify
Converts an asynchronous function to return a promise.
Use currying to return a function returning a Promise that calls the original function.
@@ -1089,6 +1099,18 @@ Omit the second argument, decimals to round to an integer.
const round = (n, decimals=0) => Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`);
// round(1.005, 2) -> 1.01
sdbmHashAlgorithm
This algorithm is a simple hash-algorithm that hashes it input string s into a whole number.
Use split('') and Array.reduce() to create a hash of the input string, utilizing bit shifting.
const sdbm = str => {
+ let arr = str.split('');
+ return arr.reduce((hashCode, currentVal) =>
+ hashCode = currentVal.charCodeAt(0) + (hashCode << 6) + (hashCode << 16) - hashCode
+ ,0)
+}
+// console.log(sdbm("name")) // -3521204949
+// console.log(sdbm("age")) // 808122783
+standardDeviation
Returns the standard deviation of an array of numbers.
Use Array.reduce() to calculate the mean, variance and the sum of the variance of the values, the variance of the values, then
@@ -1154,12 +1176,12 @@ Also if you give it a special key (childIndicator) it will search d
} else if (!keysToKeep.includes(key)) {
delete obj[key];
}
- })
+ });
+ return obj;
}
/*
const testObj = {a: 1, b: 2, children: {a: 1, b: 2}}
- cleanObj(testObj, ["a"],"children")
- console.log(testObj)// { a: 1, children : { a: 1}}
+ cleanObj(testObj, ["a"],"children") // { a: 1, children : { a: 1}}
*/
objectFromPairs
randomHexColor
Generates a random hexadecimal color code.
+Use Math.random to generate a random 24-bit(6x4bits) hexadecimal number. Use bit shifting and then convert it to an hexadecimal String using toString(16).
const randomHexColor = () => {
+ let n = (Math.random()*0xfffff|0).toString(16);
+ return '#' + (n.length !== 6
+ ? (Math.random()*0xf|0).toString(16) + n : n);
+}
+// randomHexColorCode() -> "#e34155"
+// randomHexColorCode() -> "#fd73a6"
+// randomHexColorCode() -> "#4144c6"
+RGBToHex
Converts the values of RGB components to a color code.
Convert given RGB parameters to hexadecimal string using bitwise left-shift operator (<<) and toString(16), then padStart(6,'0') to get a 6-digit hexadecimal value.
Number() to check if the coercion holds.
const validateNumber = n => !isNaN(parseFloat(n)) && isFinite(n) && Number(n) == n;
// validateNumber('10') -> true
Uncategorized
-pipeFunctions
Performs left-to-right function composition.
-Use Array.reduce() with the spread operator (...) to perform left-to-right function composition.
-The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.
const pipeFunctions = (...fns) => fns.reduce((f, g) => (...args) => g(f(...args)));
-/*
-const add5 = x => x + 5
-const multiply = (x, y) => x * y
-const multiplyAndAdd5 = pipeFunctions(multiply, add5)
-multiplyAndAdd5(5, 2) -> 15
-*/
-randomHexColor
Generates a random hexadecimal color code.
-Use Math.random to generate a random 24-bit(6x4bits) hexadecimal number. Use bit shifting and then convert it to an hexadecimal String using toString(16).
const randomHexColor = () => {
- let n = (Math.random()*0xfffff|0).toString(16);
- return '#' + (n.length !== 6
- ? (Math.random()*0xf|0).toString(16) + n : n);
-}
-// randomHexColorCode() -> "#e34155"
-// randomHexColorCode() -> "#fd73a6"
-// randomHexColorCode() -> "#4144c6"
-sdbmHashAlgorithm
This algorithm is a simple hash-algorithm that hashes it input string s into a whole number.
Use split('') and Array.reduce() to create a hash of the input string, utilizing bit shifting.
const sdbm = str => {
- let arr = str.split('');
- return arr.reduce((hashCode, currentVal) =>
- hashCode = currentVal.charCodeAt(0) + (hashCode << 6) + (hashCode << 16) - hashCode
- ,0)
-}
-// console.log(sdbm("name")) // -3521204949
-// console.log(sdbm("age")) // 808122783
-