arrayMethodSummary.md

[JavaScript] - Array Method Summary

SOURCE

To Mutate Original Array

• Add to original:
  • .push (end)
  • .unshift (start)
• Remove from original:
  • .pop (end)
  • .shift (start)
  • .splice (any)
• Others:
  • .reverse
  • .sort
  • .fill

Produce A New Array:

• Computed form original:
  • .map (loop)
• Filtered using condition:
  • .filter
• Portion of original:
  • .slice
• Adding original to other:
  • .concat
• Flattening the original:
  • .flat
  • .flatMap

Find An Array Index:

• Based on value:
  • .indexOf
• Based on a condition:
  • .findIndex

Find An Array Element:

• Based on a condition:
  • .find

Check If Array Includes:

• Based on value:
  • .includes
• Based on a condition:
  • .some
  • .every

Create A New String:

• Based on a separator:
  • .join

Transform To Value:

• Based on accumulator:
  • .reduce (reduce the whole array into a single value of any type: number, string, boolean, new array or object)

Loop:

• Based on callback:
  • .forEach