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Discussion on: 20 Killer JavaScript One-Liners That’ll Save You Hours of Coding 🤯🔥

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wiseai profile image
Mahmoud Harmouch • • Edited

Thanks for sharing. I have added the python equivalent (assuming an array is a list in python for simplicity):

1) Find the max value in an array: 

max(array)
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2) Remove duplicates from an array: 

[*set(array)]
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3) Generate a random number between 1 and 100: 

import random; random.randint(1, 100) # one-liner, LOL.
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4) Check if a string is a valid number:

Your method is not correct:

!isNaN(parseFloat("123.asd")) // true
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Probably you meant "Check if a string contains a number"?

python equivalent:

string.lstrip('-').replace('.','',1).isdigit()
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5) Get the current date and time: 

from datetime import datetime; datetime.utcnow() # datetime.datetime(2023, 1, 28, 8, 24, 41, 221834)
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6) Check if a variable is an array: 

type(array) is list
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7) Check if a variable is an object: 

issubclass(variable , object)
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8) Convert an array to a string: 

",".join(array)
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9) Check if a variable is a function: 

import inspect; inspect.isfunction(variable)
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10) Convert an object to an array:

Depends on the type of the object. For example dict:

[*dict_object.items())]
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11) Count the occurrences of an element in an array: 

array.count(element)
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12) Create a new object with a dynamic key and value: 

{ key: value}
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13) Check if a string is a palindrome: 

string == string[::-1]
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14) Get the the sum of all the numbers in an array 

sum(array)
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or

from functools import reduce, operator; reduce(operator.add, array)
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15) Get the current timestamp: 

from datetime import datetime; datetime.timestamp(datetime.now())
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16) Check if a variable is null (None in python): 

not variable
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17) Check if a variable is undefined: 

'variable' in vars() or 'variable' in globals()
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18) Find the minimum value in an array 

min(array)
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19) Check if an array is empty: 

not array
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20) Create a new array with a specified range of numbers: 

[* range(n)]
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rammcodes profile image
Ram Maheshwari ♾️ •

This is amazing, Thanks a lot for sharing 🔥🙌

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rjbudzynski profile image
rjbudzynski •

19 can be simplified tonot array.

6 to type(array) is list

BTW in a python context array usually refers to numpy array rather than list.

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wiseai profile image
Mahmoud Harmouch •

Thanks for the heads up. Fixed!