30秒学会 JavaScript 片段 – isStream
作用：检查给定的参数是否是 stream。
实现思路：首先检查是否是 null，如果不是的话再使用 typeof 检查是否中 object，并且其属性 pipe 是否是 function 类型。
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- 分类： 30秒 JavaScript 片段
- 标签： JavaScript, node, type, 代码片段, 进阶
30秒学会 JavaScript 片段 – bindAll
Binds methods of an object to the object itself, overwriting the existing method.
Use Array.prototype.forEach() to return a function that uses Function.prototype.apply() to apply the given context (obj) to fn for each function specified.
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- 分类： 30秒 JavaScript 片段
- 标签： function, JavaScript, object, 代码片段, 进阶
30秒学会 Golang 片段 – RandIntSliceInRange
Returns a slice of n random integers in the specified range.
Use make() to create an appropriate slice.
Use range to iterate over the slice, rand.Intn() to generate random numbers between 0 and the distance between min and max, adding min to them.
30秒学会 JavaScript 片段 – dropRight
Returns a new array with n elements removed from the right.
Use Array.prototype.slice() to remove the specified number of elements from the right.
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- 分类： 30秒 JavaScript 片段
- 标签： array, JavaScript, 代码片段, 入门
30秒学会 Dart 片段 – dropRightWhile
Removes elements from the end of a list until the passed function returns true and returns the remaining elements.
Use List.lastIndexWhere() with the test function to find the last element that returns true.
Return an empty array if there are no matching elements, otherwise use List.sublist() to return the remaining elements.
30秒学会 Python 片段 – is_divisible
Checks if the first numeric argument is divisible by the second one.
Use the modulo operator (%) to check if the remainder is equal to 0.
30秒学会 JavaScript 片段 – isDivisible
Checks if the first numeric argument is divisible by the second one.
Use the modulo operator (%) to check if the remainder is equal to 0.
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- 分类： 30秒 JavaScript 片段
- 标签： JavaScript, math, 代码片段, 入门
30秒学会 Golang 片段 – Rads
Converts an angle from degrees to radians.
Use math.Pi and the degree to radian formula to convert the angle from degrees to radians.
30秒学会 JavaScript 片段 – dayOfYear
Gets the day of the year from a Date object.
Use new Date() and Date.prototype.getFullYear() to get the first day of the year as a Date object, subtract it from the provided date and divide with the milliseconds in each day to get the result.
Use Math.floor() to appropriately round the resulting day count to an integer.
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- 分类： 30秒 JavaScript 片段
- 标签： date, JavaScript, 代码片段, 入门