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Reza Lavarian

Hey 👋 I'm a software engineer, an author, and an open-source contributor. I enjoy helping people (including myself) decode the complex side of technology.

JavaScript list (array) comprehension explained with examples

JavaScript list (array) comprehension explained with examples

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4 min read

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How to fix “ValueError: I/O operation on closed file” in Python

How to fix “ValueError: I/O operation on closed file” in Python

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3 min read
Four ways to check if a variable is a string in JavaScript (with examples)

Four ways to check if a variable is a string in JavaScript (with examples)

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4 min read
Python __new__() method explained with examples

Python __new__() method explained with examples

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4 min read
Label htmlFor Property Explained

Label htmlFor Property Explained

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About “ReferenceError: document is not defined” in JavaScript

About “ReferenceError: document is not defined” in JavaScript

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About "SyntaxError: Unexpected end of JSON input" in JavaScript

About "SyntaxError: Unexpected end of JSON input" in JavaScript

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2 min read
Add commas to numbers in JavaScript (Explained with examples)

Add commas to numbers in JavaScript (Explained with examples)

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How to remove the last character from a string in PHP

How to remove the last character from a string in PHP

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4 min read
About "TypeError: map is not a function" in JavaScript

About "TypeError: map is not a function" in JavaScript

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Cannot find module error in Node.js (Fixed)

Cannot find module error in Node.js (Fixed)

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PHP double question marks (Null coalescing operator) explained

PHP double question marks (Null coalescing operator) explained

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How to Flatten an array in PHP (four methods)

How to Flatten an array in PHP (four methods)

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4 min read
PHP replace space with dash explained with examples

PHP replace space with dash explained with examples

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Integer division in JavaScript explained

Integer division in JavaScript explained

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JavaScript isset Equivalent (3 methods)

JavaScript isset Equivalent (3 methods)

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How to check if an element exists in JavaScript (with examples)

How to check if an element exists in JavaScript (with examples)

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3 min read
Get viewport width and height in JavaScript (with examples)

Get viewport width and height in JavaScript (with examples)

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2 min read
About “__dirname is not defined in ES module scope” in JavaScript

About “__dirname is not defined in ES module scope” in JavaScript

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2 min read
How to get yesterday’s date in JavaScript without a library

How to get yesterday’s date in JavaScript without a library

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How to add days to a date in JavaScript (without a library)

How to add days to a date in JavaScript (without a library)

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Subtract days from a date in JavaScript without a library

Subtract days from a date in JavaScript without a library

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Get the day of the week in JavaScript without a library

Get the day of the week in JavaScript without a library

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3 min read
JavaScript double exclamation mark explained (with examples)

JavaScript double exclamation mark explained (with examples)

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4 min read
Javascript if/else shorthand explained (with common uses cases)

Javascript if/else shorthand explained (with common uses cases)

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About "Cannot use import statement outside a module" in JavaScript

About "Cannot use import statement outside a module" in JavaScript

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3 min read
About "‘str’ object has no attribute ‘decode’" error in Python

About "‘str’ object has no attribute ‘decode’" error in Python

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2 min read
About "getElementById is not a function" in JavaScript

About "getElementById is not a function" in JavaScript

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3 min read
Convert a dd/mm/yyyy string to a Date object in JavaScript

Convert a dd/mm/yyyy string to a Date object in JavaScript

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About "Await is only valid in Async functions" error in JavaScript

About "Await is only valid in Async functions" error in JavaScript

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About "AttributeError module ‘DateTime’ has no attribute ‘strptime’" in Python

About "AttributeError module ‘DateTime’ has no attribute ‘strptime’" in Python

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About "Unindent does not match any outer indentation level" error in Python

About "Unindent does not match any outer indentation level" error in Python

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About "missing 1 required positional argument: ‘self’" in Python

About "missing 1 required positional argument: ‘self’" in Python

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How to reverse a range in Python (with examples)

How to reverse a range in Python (with examples)

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About "TypeError: unhashable type: ‘dict'” in Python

About "TypeError: unhashable type: ‘dict'” in Python

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On "TabError: inconsistent use of tabs and spaces in indentation" in Python

On "TabError: inconsistent use of tabs and spaces in indentation" in Python

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About "Not all arguments converted during string formatting" error in Python

About "Not all arguments converted during string formatting" error in Python

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About "can only concatenate str (not “list”) to str" in Python

About "can only concatenate str (not “list”) to str" in Python

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How to fix "can only concatenate str (not “dict”) to str" in Python

How to fix "can only concatenate str (not “dict”) to str" in Python

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How to fix "can only concatenate str (not “bool”) to str" in Python

How to fix "can only concatenate str (not “bool”) to str" in Python

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How to fix "can only concatenate str (not “int”) to str" in Python

How to fix "can only concatenate str (not “int”) to str" in Python

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About 'can only concatenate str (not “float”) to str' error in Python

About 'can only concatenate str (not “float”) to str' error in Python

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How to fix “TypeError: ‘float’ object is not callable” in Python

How to fix “TypeError: ‘float’ object is not callable” in Python

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How to fix "‘dict’ object is not callable" in Python

How to fix "‘dict’ object is not callable" in Python

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How to fix "‘tuple’ object is not callable" in Python

How to fix "‘tuple’ object is not callable" in Python

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How to fix "‘bool’ object is not callable" in Python

How to fix "‘bool’ object is not callable" in Python

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How to fix "SyntaxError: invalid decimal literal" in Python

How to fix "SyntaxError: invalid decimal literal" in Python

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How to fix "SyntaxError: ‘break’ outside loop" in Python

How to fix "SyntaxError: ‘break’ outside loop" in Python

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How to fix "SyntaxError: ‘continue’ not properly in loop" in Python

How to fix "SyntaxError: ‘continue’ not properly in loop" in Python

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How to fix "SyntaxError: cannot assign to function call here" in Python

How to fix "SyntaxError: cannot assign to function call here" in Python

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How to fix "SyntaxError: cannot assign to literal here" in Python

How to fix "SyntaxError: cannot assign to literal here" in Python

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How to fix "SyntaxError: cannot assign to expression here" in Python

How to fix "SyntaxError: cannot assign to expression here" in Python

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How to fix "SyntaxError: EOL while scanning string literal" in Python

How to fix "SyntaxError: EOL while scanning string literal" in Python

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How to fix "SyntaxError: unterminated string literal" in Python

How to fix "SyntaxError: unterminated string literal" in Python

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How to fix "SyntaxError: invalid character" in Python

How to fix "SyntaxError: invalid character" in Python

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how to fix "SyntaxError: invalid non-printable character" in Python

how to fix "SyntaxError: invalid non-printable character" in Python

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How to fix "SyntaxError: Missing parentheses in call to ‘print’" in Python

How to fix "SyntaxError: Missing parentheses in call to ‘print’" in Python

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How to fix "SyntaxError: positional argument follows keyword argument" in Python

How to fix "SyntaxError: positional argument follows keyword argument" in Python

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[Solved] SyntaxError: ‘return’ outside function in Python

[Solved] SyntaxError: ‘return’ outside function in Python

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How to fix SyntaxError: unterminated triple-quoted string literal in Python

How to fix SyntaxError: unterminated triple-quoted string literal in Python

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