JavaScript Array Methods

• at();
• concat();
• copyWithin();
• entries();
• every();
• fill();
• filter();
• find();
• findIndex();
• findLast();
• findLastIndex();
• flat();
• flatMap();
• forEach();
• includes();
• indexOf();
• join();
• keys();
• lastIndexOf();
• length();
• map();
• pop();
• push();
• reduce();
• reduceRight();
• reverse();
• shift();
• slice();
• some();
• sort();
• splice();
• toLocaleString();
• toReversed()
• toSorted();
• toSpliced();
• toString();
• unshift();
• values();
• with();

1. CREATE (Add Data)

• push()
• unshift()
• concat()
• splice()

2. READ (Access Data)

• at() – Access by index (supports negative index)
• length – Get array length
• includes() – Check if value exists
• indexOf() / lastIndexOf() – Find index
• find() – First match by condition
• findIndex() – Index of first match
• findLast() – Last match by condition
• findLastIndex() – Last matching index
• some() – At least one matches
• some() – At least one matches
• entries() – Get index + value iterator
• keys() – Get index iterator
• values() – Get value iterator

3. UPDATE (Modify Data)

• splice() – Replace elements
• with() – Replace by index (immutable)

4. DELETE (Remove Data)

• pop() – Remove last
• shift() – Remove first
• splice() – Remove by index
• filter() – Remove by
• fill() – Fill with value
• copyWithin() – Copy part of array
• reverse() – Reverse in place
• sort() – Sort in place
• map() – Transform values (returns new array)
• flat() – Flatten nested arrays
• flatMap() – Map + flatten
• reduce() – Reduce to single value
• reduceRight() – Reduce from right
• forEach() – Loop (no return)

5. IMMUTABLE (Modern Non-Mutating Methods)

• toReversed()
• toSorted()
• toSpliced()
• with()

6. CONVERSION METHODS

• join()
• toString()
• toLocaleString()