Tips & Tricks

Programming Popular

Use Object.assign() to Clone Objects

Problem

Assigning objects creates references, causing accidental mutations.

Solution

Use Object.assign({}, obj) or spread {...obj} to create shallow copies.

Benefit

Prevents mutation bugs and allows safe object manipulation.

Code Example Read tip

Math

Square Numbers Near 50

Problem

Squaring numbers like 48 or 52 requires long multiplication.

Solution

Use (50-a)² = 2500 - 100a + a² or (50+a)² = 2500 + 100a + a²

Benefit

Converts difficult squares into simple arithmetic around 2500.

Example Read tip

Programming

Use Array.some() and Array.every()

Problem

Checking if any/all items meet a condition requires manual loops with break statements.

Solution

Use Array.some() to check if any item matches, Array.every() for all items.

Benefit

More readable and stops execution early for better performance.

Code Example Read tip

Math

Divisibility Rule for 4

Problem

Testing divisibility by 4 for large numbers requires division.

Solution

Check only the last two digits. If they form a number divisible by 4, the whole number is.

Benefit

Instantly test any number for divisibility by 4.

Example Read tip

Programming

Use Array.flat() to Flatten Nested Arrays

Problem

Flattening nested arrays requires recursive functions or complex reduce logic.

Solution

Use Array.flat(depth) to flatten arrays to specified depth in one line.

Benefit

Eliminates 20+ lines of recursive flattening code.

Code Example Read tip

Math

Divisibility Rule for 6

Problem

Checking divisibility by 6 requires checking both 2 and 3 separately.

Solution

Number must be even AND sum of digits divisible by 3.

Benefit

Combines two simple rules for quick divisibility check.

Example Read tip

Programming Popular

Use Promise.all() for Parallel Async Operations

Problem

Sequential await calls waste time when operations could run in parallel.

Solution

Use Promise.all() to execute multiple async operations simultaneously.

Benefit

Can reduce execution time by 70% for independent async operations.

Code Example Read tip

Math Popular

Multiply by 25 Instantly

Problem

Multiplying by 25 requires complex long multiplication.

Solution

Divide by 4 and multiply by 100 (or multiply by 100 and divide by 4).

Benefit

Converts multiplication into simple division by 4.

Example Read tip