Small Ideas That Solve Real Problems

Converting NodeLists, Sets, or strings to arrays requires complex manual conversion.

Use Array.from() to convert any iterable into an array with optional mapping.

Universal conversion solution that works with all iterable types.

Figuring out what day of the week a date falls on requires a calendar.

Use Zeller's congruence simplified: Learn anchor days for each month and count forward/backward.

Impress others by calculating any date's day of week mentally.

Conditional execution often requires verbose if statements for simple cases.

Use && for conditional execution and || for fallback values in one line.

Reduces simple conditionals from 5 lines to 1 line.

Calculating how long it takes for investment to double requires complex formulas.

Divide 72 by the interest rate to get approximate years to double.

Quick investment doubling time calculation without formulas or calculators.

Parsing JSON with dates or special types requires manual post-processing.

Use the reviver parameter in JSON.parse() to transform values during parsing.

Automates type conversion and eliminates separate transformation loops.

Finding cube roots mentally is extremely difficult.

Memorize cubes 1-10, then find which two cubes the number falls between.

Estimate cube roots within ±0.5 by knowing 10 reference points.

Creating objects from variables requires repetitive key-value pairs.

Use ES6 shorthand to omit the value when key and variable name are the same.

Reduces object creation code by 50% and improves readability.

Calculating percentage change between two values is confusing and error-prone.

((New - Old) / Old) × 100. Positive = increase, negative = decrease.

Universal formula for all percentage change calculations.