- JAVASCRIPT IS A HIGH-LEVEL PROTOTYPE-BASED OBJECT-ORIENTED MULTI-PARADIGM INTERPRETED OR JUST-IN-TIME COMPILED DYNAMIC SINGLE-THREADED GARBAGE-COLLECTED PROGRAMMING LANGUAGE WITH FIRST-CLASS FUNCTIONS AND A NON-BLOCKING EVENT LOOP CONCURRENCY MODEL. 🙂🙂🙂
| To mutate original array | A new array |
|---|---|
| Add to original: .push (end) .unshift (start) | Computed from original: .map(loop) |
| Remove from original: .pop (end) .shift(start) .splice(any)Others: .reverse .sort .fill | Filtered using condition: .filter, Portion of original: .slice Adding original to other .concat, Flattening the original: .flat, .flatMap |
| An Array index | An array element |
|---|---|
| Based on value: .indexOf Based on test condition: .findIndex | Based on test condition: .find |
| Know if array includes | A new String |
|---|---|
| Based on value: .includes Based on test condition:.some, .every | Based on separator string: .join |
| To transform to value | To just loop array |
|---|---|
| Based on accumulator: .reduce (Boil down array to single value of any type: number, string, boolean, or even new array or object) | Based on callback .forEach(Does not create a new array, just loops over it) |