Array Iteration Methods in JavaScript

April/16/2026

Array Iteration Methods.

JavaScript Array Iteration methods perform some operation on each element of the array. Array iteration means accessing each element of an array.

Array Iteration Methods.

1. arrayName.forEach
2. arrayName.map()
3. arrayName.flatMap()
4. arrayName.filter()
5. arrayName.reduce()
6. arrayName.reduceRight()
7. arrayName.every()
8. arrayName.some()this method is used the same for every method(TBD)
9. arrayName.from() (TBD)
10. arrayName.keys() (TBD)
11. arrayName.entries() (TBD)
12. arrayName.with()
13. arrayName.Spread(...)
14. arrayName.Rest(...) (TBD)

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*1. arrayName.forEach *

The forEach method calls a function as a callback function once for each element. The forEach method has no return values.

The function takes 3 arguments:
values, index, array

Here, the arrow function is used in a score(values), count(index), and array(array).

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2. arrayName.map()

The map method calls a function as a callback function once for each element. The map method has given a return value, and the main element has not changed, giving a duplicate.

Here, the arrow function is used in a score(values), and duplicate values are multiplied by 10.

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3. arrayName.flatMap()

The flatMap() method first maps all elements of an array, and then creates a new array by flattening.

Here, the arrow function is used in a score(values), in an arrayname values, and copy values.

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4. arrayName.filter()

The filter method, less than <, and greater > than are used for objects

Here, fewer than 35 values give me.

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5. arrayName.reduce()

The reduce() method for the array elements, one by one, to give a single value, and the method works from left to right in the array

Here, the arrayName value is total.

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6. arrayName.reduceRight()

The reduceRight() method for the array elements, one by one, to give a single value. The method works from right to left in the array

Same for the reduce method, but value added right to left.

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7. arrayName.every()

The every() method is used in Boolean values for objects.

Here, a Boolean value gives a true or false. score less than 35.

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8. arrayName.some()

The same method is used for Boolean operations for every method.

Here, a Boolean value gives a true or false. score less than 35.

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9. arrayName.from()

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12. arrayName.with()

The with() method is a replacement, to array elements

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13. arrayName.Spread(...)

The spread method used for the two-array merge converts a single array value.

Here, ...three dots are used to give a full element.

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