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30secondsofcode
2020-01-03 07:10:15 +00:00
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106
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"text": "Performs right-to-left function composition.\n\nUse `reduce()` to perform right-to-left function composition. \nThe last (rightmost) function can accept one or more arguments; the remaining functions must be unary.\n\n",
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"title": "compose_right",
"attributes": {
"text": "Performs left-to-right function composition.\n\nUse `reduce()` to perform left-to-right function composition. \nThe first (leftmost) function can accept one or more arguments; the remaining functions must be unary.\n\n",
"tags": [
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"title": "curry",
"attributes": {
"text": "Curries a function.\n\nUse `partial()` to return a new partial object which behaves like `fn` with the given arguments, `args`, partially applied.\n\n",
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"id": "delay",
"type": "snippetListing",
"title": "delay",
"attributes": {
"text": "Invokes the provided function after `ms` milliseconds.\n\nUse `sleep()` to delay the execution of `fn` by `ms / 1000` seconds.\n\n",
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"title": "unfold",
"attributes": {
"text": "Builds a list, using an iterator function and an initial seed value.\n\nThe iterator function accepts one argument (`seed`) and must always return a list with two elements ([`value`, `nextSeed`]) or `False` to terminate.\nUse a generator function, `fn_generator`, that uses a `while` loop to call the iterator function and `yield` the `value` until it returns `False`.\nUse list comprehension to return the list that is produced by the generator, using the iterator function.\n\n",
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"text": "Tests a value, `x`, against a `predicate` function, conditionally applying a function. \n\nCheck if the value of `predicate(x)` is `True` and if so return `when_true(x)`, otherwise return `x`.\n\n",
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"text": "Given a predicate function, `fn`, and a `prop` string, this curried function will then take an object to inspect by calling the property and passing it to the predicate.\n\nReturn a `lambda` function that takes an object and applies the predicate function, `fn` to the specified property.\n\n",
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"code": "def check_prop(fn, prop):\r\n return lambda obj: fn(obj[prop])",
"example": "check_age = check_prop(lambda x: x >= 18, 'age')\r\nuser = {\r\n 'name': 'Mark',\r\n 'age': 18\r\n}\r\n\r\ncheck_age(user) # True"
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"title": "compose",
"type": "snippet",
"attributes": {
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"text": "Performs right-to-left function composition.\n\nUse `reduce()` to perform right-to-left function composition. \nThe last (rightmost) function can accept one or more arguments; the remaining functions must be unary.\n\n",
"codeBlocks": {
"code": "from functools import reduce\r\n\r\ndef compose(*fns):\r\n return reduce(lambda f, g: lambda *args: f(g(*args)), fns)",
"example": "add5 = lambda x: x + 5\r\nmultiply = lambda x, y: x * y\r\nmultiply_and_add_5 = compose(add5, multiply)\r\n\r\nmultiply_and_add_5(5, 2) # 15"
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"text": "Performs left-to-right function composition.\n\nUse `reduce()` to perform left-to-right function composition. \nThe first (leftmost) function can accept one or more arguments; the remaining functions must be unary.\n\n",
"codeBlocks": {
"code": "from functools import reduce\r\n\r\ndef compose_right(*fns):\r\n return reduce(lambda f, g: lambda *args: g(f(*args)), fns)",
"example": "add = lambda x, y: x + y\r\nsquare = lambda x: x * x\r\nadd_and_square = compose_right(add,square)\r\n\r\nadd_and_square(1, 2) # 9"
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"text": "Curries a function.\n\nUse `partial()` to return a new partial object which behaves like `fn` with the given arguments, `args`, partially applied.\n\n",
"codeBlocks": {
"code": "from functools import partial\r\n\r\ndef curry(fn, *args):\r\n return partial(fn,*args)",
"example": "add = lambda x, y: x + y\r\nadd10 = curry(sum, 10)\r\n\r\nadd10(20) # 30"
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@ -463,6 +559,30 @@
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"id": "delay",
"title": "delay",
"type": "snippet",
"attributes": {
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"text": "Invokes the provided function after `ms` milliseconds.\n\nUse `sleep()` to delay the execution of `fn` by `ms / 1000` seconds.\n\n",
"codeBlocks": {
"code": "from time import sleep\r\n\r\ndef delay(fn, ms, *args):\r\n sleep(ms / 1000)\r\n return fn(*args)",
"example": "delay(\r\n lambda x: print(x),\r\n 1000,\r\n 'later'\r\n) # prints 'later' after one second"
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@ -1836,6 +1956,31 @@
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"title": "unfold",
"type": "snippet",
"attributes": {
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"text": "Builds a list, using an iterator function and an initial seed value.\n\nThe iterator function accepts one argument (`seed`) and must always return a list with two elements ([`value`, `nextSeed`]) or `False` to terminate.\nUse a generator function, `fn_generator`, that uses a `while` loop to call the iterator function and `yield` the `value` until it returns `False`.\nUse list comprehension to return the list that is produced by the generator, using the iterator function.\n\n",
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"code": "def unfold(fn, seed):\n def fn_generator(val):\n while True: \n val = fn(val[1])\n if val == False: break\n yield val[0]\n return [i for i in fn_generator([None, seed])]",
"example": "f = lambda n: False if n > 50 else [-n, n + 10]\nunfold(f, 10) # [-10, -20, -30, -40, -50]"
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"title": "when",
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"text": "Tests a value, `x`, against a `predicate` function, conditionally applying a function. \n\nCheck if the value of `predicate(x)` is `True` and if so return `when_true(x)`, otherwise return `x`.\n\n",
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"code": "def when(predicate, when_true):\n return lambda x: when_true(x) if predicate(x) else x",
"example": "double_even_numbers = when(lambda x: x % 2 == 0, lambda x : x * 2)\ndouble_even_numbers(2) # 4\ndouble_even_numbers(1) # 1"
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