Thread by @MrConerMurphy

📣 Massive JavaScript Resource Collection 📣

All 37 JavaScript Array methods (current & experimental) explained in images 👇

1️⃣ Array .at()

.at() lets us access elements in an Array by providing an index.

Both positive and negative ones are supported. 👇

2️⃣ Array .concat()

This method lets us join multiple arrays into one while leaving the original one untouched.

New arrays are added to the end of the previous ones. 👇

3️⃣ Array .copyWithin()

.copyWithin() let's copy elements within an array to another location within that array. 👇

4️⃣ Array .entries()

.entries() returns a key/value pair for each index in the array, we can then loop through the iterator using a for...of loop. 👇

5️⃣ Array .every()

.every() lets us test every value in an array against a provided function, if they all pass it returns true, otherwise false. 👇

6️⃣ Array .fill()

.fill() lets us fill either an entire array or part of one with a given value. 👇

7️⃣ Array .filter()

.filter() allows us to filter an array to only the values that pass a provided test function. 👇

8️⃣ Array .find()

.find() allow us to test each item in an array, the first value that passes the test is returned. 👇

9️⃣ Array .findIndex()

Similar to .find() but this time instead of returning the first element that passes the test, we return the index of it. 👇

1️⃣0️⃣ Array .flat()

.flat() lets us flatten nested arrays down levels. We can control the number of levels falttened by using the depth parameter. 👇

1️⃣1️⃣ Array .flatMap()

.flatMap() is like calling a .map() followed by a .flat() but it will only let us flatten one level of arrays. 👇

1️⃣2️⃣ Array .forEach()

.forEach() allows us to iterate over an array. .forEach() does not return any values from the array, only undefined. 👇

1️⃣3️⃣ Array .from()

.from() lets us create a new array from an array-like value, we can also map over each item as we create the new array 👇

1️⃣4️⃣ Array .includes()

.includes() lets us search an array for a provided value if it's found in the array, true is returned otherwise false 👇

1️⃣5️⃣ Array .indexOf()

.indexOf() lets us search an array for a given value, if it's found it's index is returned.

.indexOf() will return on the first occurrence of the value 👇

1️⃣6️⃣ Array .isArray()

.isArray() allows us to test if a provided value is an Array or not. 👇

1️⃣7️⃣ Array .join()

.join() takes a provided string and joins each element in the array with it. 👇

1️⃣8️⃣ Array .keys()

.keys() creates an iterator that contains all of the indexes in the array, black spaces aren't ignored. 👇

1️⃣9️⃣ Array .lastIndexOf()

.lastIndexOf() returns the last index that a provided element is found at in an array. 👇

2️⃣0️⃣ Array .groupBy()

.groupBy() is one of the newest array methods, it allows us to group objects in an array by properties they share. 👇

2️⃣1️⃣ Array .groupByToMap()

.groupByToMap() was added along with .groupBy(), it allows us to group objects like .groupBy() but it then allows us to add them to a Map object based on a property. 👇

2️⃣2️⃣ Array .map()

.map() lets us iterate over an array and return a new array with the new values from any manipulations we perform. 👇

2️⃣3️⃣ Array .of()

.of() allows us to create a new array from the values we pass to it, regardless of the quantity or their type. 👇

2️⃣4️⃣ Array .pop()

.pop() removes the last item from the array and returns it. 👇

2️⃣5️⃣ Array .push()

.push() allows us to add multiple new items to an array, it returns the updated array's length. 👇

2️⃣6️⃣ Array .reduce()

.reduce() lets us define a custom reducer function to be performed on each element in the array, going from left to right in the array. 👇

2️⃣7️⃣ Array .reduceRight()

.reduceRight() is the same as .reduce() but instead going from right to left in the array. 👇

2️⃣8️⃣ Array .reverse()

.reverse() will reverse an array in place, meaning the first item becomes the last and the last the first. 👇

2️⃣9️⃣ Array .shift()

.shift() removes the first item from the array and returns it. 👇

3️⃣0️⃣ Array .slice()

.slice() allows you to take a copy of an array either as a whole or part of it. The original array is left untouched. 👇

3️⃣1️⃣ Array .some()

.some() checks if at least one item in an array passes the provided test function, if so it returns true otherwise false. 👇

3️⃣2️⃣ Array .sort()

.sort() allows you to sort an array based on a provided sorting function. 👇

3️⃣3️⃣ Array .splice()

.splice() allows you to remove or replace items in an array and return the removed/replaced items. 👇

3️⃣4️⃣ Array .toLocaleString()

.toLocaleString() will convert the array it's called on to a string and then separate the string with a locale-specific string (e.g. ',') 👇

3️⃣5️⃣ Array .toString()

.toString() will recursively flatten an array until it's one level and convert it to a string separated by a comma. 👇

3️⃣6️⃣ Array .unshift()

.unshift() adds one or more values provided to the beginning of the array and returns the updated length of the array. 👇

3️⃣7️⃣ Array .values()

.values() returns an iterator object containing a value for every index in the array which we can then loop over with a for...of loop. 👇

Did you enjoy this thread/find it helpful?

If so please consider doing one of the below to show your support:

❤️ Like these tweets
🔄 Retweet the 1st tweet in this thread so others can see it.
👤 Follow me ( @MrConerMurphy ) for more content like this.
🔔 Turn on notifications