array map

const myArray = ['Sam', 'Alice', 'Nick', 'Matt'];

// Appends text to each element of the array
const newArray = myArray.map(name => {
	return 'My name is ' + name; 
});
console.log(newArray); // ['My name is Sam', 'My Name is Alice', ...]

// Appends the index of each element with it's value
const anotherArray = myArray.map((value, index) => index + ": " + value);
console.log(anotherArray); // ['0: Sam', '1: Alice', '2: Nick', ...]

// Starting array is unchanged
console.log(myArray); // ['Sam', 'Alice', 'Nick', 'Matt']

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Awgiedawgie 440220 points

                                    let numbers = [1, 2, 3, 4]
let filteredNumbers = numbers.map(function(num, index) {
  if (index &lt; 3) {
     return num
  }
})
// index goes from 0, so the filterNumbers are 1,2,3 and undefined.
// filteredNumbers is [1, 2, 3, undefined]
// numbers is still [1, 2, 3, 4]

Thank you! 3

3.67 (3 Votes)

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0

4

Awgiedawgie 440220 points

                                    let numbers = [1, 4, 9]
let roots = numbers.map(function(num) {
    return Math.sqrt(num)
})
// roots is now     [1, 2, 3]
// numbers is still [1, 4, 9]

Thank you! 4

0

0

0

0

Awgiedawgie 440220 points

                                    let A = [{ x:'x', y:'y' }, { x:'x', y:'y' }];

let result = A.map(({y,...rest})=&gt; ({...rest,v:y}));

console.log(result);

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0

0

4.1

10

Awgiedawgie 440220 points

                                    let numbers = [1, 2, 3, 4]
let filteredNumbers = numbers.map(function(_, index) {
  if (index &lt; 3) {
     return num
  }
})
// index goes from 0, so the filterNumbers are 1,2,3 and undefined.
// filteredNumbers is [1, 2, 3, undefined]
// numbers is still [1, 2, 3, 4]

Thank you! 10

4.1 (10 Votes)

0

3.67

6

Awgiedawgie 440220 points

                                    const array1 = [1, 4, 9, 16];

// pass a function to map
const map1 = array1.map(x =&gt; x * 2);

console.log(map1);
// expected output: Array [2, 8, 18, 32]

Thank you! 6

3.67 (6 Votes)

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