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JavaScript Array methods explained
Let's start!
1. concat()
Returns a new array that is this array joined with other array(s) and/or value(s).
const fruits = ['', '', '', ''];const vegetables = ['', '', '', ''];// 1. concat()const food = fruits.concat(vegetables); // ["", "", "", "", "", "", "", ""]2. copyWithin()
Copies a sequence of array elements within the array.
// 2. copyWithin()const fruits = ['', '', '', ''];const fruitsCopy = fruits.copyWithin(0, 2); // ["", "", "", ""]3. every()
Returns true if every element in this array satisfies the testing function.
// 3. every()const fruits = ['', '', '', ''];const allBananas = fruits.every(fruit => fruit === ''); // false4. fill()
Fills all the elements of an array from a start index to an end index with a static value.
// 4. fill()const fruits = ['', '', '', ''];const lemons = fruits.fill(''); // ["", "", "", ""]5. filter()
Returns a new array containing all elements of the calling array for which the provided filtering function returns true.
// 5. filter()const fruits = ['', '', '', ''];const onlyBananas = ['', '', '', ''].filter(fruit => fruit === ''); // ["", ""]6. find()
Returns the found element in the array, if some element in the array satisfies the testing function, or undefined if not found.
// 6. find()const fruits = ['', '', '', ''];const cherry = fruits.find(fruit => fruit === ''); // ""7. findIndex()
Returns the found index in the array, if an element in the array satisfies the testing function, or -1 if not found.
// 7. findIndex()const fruits = ['', '', '', ''];const cherryIndex = fruits.findIndex(fruit => fruit === ''); // 28. forEach()
Calls a function for each element in the array.
// 8. forEach()const vegetables = ['', '', '', ''];vegetables.forEach(vegetable => console.log(vegetable));// ""// ""// ""// ""9. includes()
Determines whether the array contains a value, returning true or false as appropriate.
// 9. includes()const vegetables = ['', '', '', ''];const includesCorn = vegetables.includes(''); // trueconst includesTomato = vegetables.includes(''); // false10. join()
Joins all elements of an array into a string.
// 10. join()const vegetables = ['', '', '', ''];const vegetablesGroup = vegetables.join(''); // ""11. map()
Returns a new array containing the results of calling a function on every element in this array.
// 11. map()const vegetables = ['', '', '', ''];const doubledVegetables = vegetables.map(vegetable => vegetable + vegetable); // ["", "", "", ""]12. push()
Adds one or more elements to the end of an array, and returns the new length of the array.
// 12. push()const fruits = ['', '', '', ''];fruits.push(''); // ["", "", "", "", ""]13. reverse()
Reverses the order of the elements of an array in place.
// 13. reverse()const fruits = ['', '', '', ''];const fruits = ['', '', '', ''];const reversedFruits = fruits.reverse(); // ["", "", "", ""]14. slice()
Extracts a section of the calling array and returns a new array.
// 14. slice()const fruits = ['', '', '', ''];fruits.slice(2); // ["", ""]15. some()
Returns true if at least one element in this array satisfies the provided testing function.
// 15. some()const fruits = ['', '', '', ''];const bananaExists = fruits.some(fruit => fruit === '')); // true16. sort()
Sorts the elements of an array in place and returns the array.
// 16. sort()const fruits = ['', '', '', '', '', '', '', '', ''];fruits.sort(); // ["", "", "", "", "", "", "", "", ""]17. splice()
Adds and/or removes elements from an array.
// 17. splice()const fruits = ['', '', '', ''];fruits.splice(2, 1, ''); // ["", "", "", ""]If you liked this article, be sure to it.
Happy coding!
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Original Link: https://dev.to/denicmarko/javascript-array-methods-explained-28fb
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