30秒学会 JavaScript 片段 – countBy
Groups the elements of an array based on the given function and returns the count of elements in eac...
Groups the elements of an array based on the given function and returns the count of elements in eac...
Checks if the given argument is a function. Use typeof to check if a value is classified as a functi...
Creates a new string with the results of calling a provided function on every character in the calli...
Delays the execution of an asynchronous function. Delay executing part of an async function, by putt...
Evaluates the binomial coefficient of two integers n and k. Use Number.isNaN() to check if any of th...
Converts a string to title case. Break the string into words, using a regexp, and combine them capit...
Returns true if the provided predicate function returns true for at least one element in a collectio...
Checks if the given argument is a number. Use typeof to check if a value is classified as a number p...
Assigns default values for all properties in an object that are undefined. Use Object.assign() to cr...
Makes a DELETE request to the passed URL. Use XMLHttpRequest web api to make a delete request to the...