find in javascript

1const simpleArray = [3, 5, 7, 15];
2const objectArray = [{ name: 'John' }, { name: 'Emma' }]
3
4console.log( simpleArray.find(e => e === 7) )
5// expected output 7
6
7console.log( simpleArray.find(e => e === 10) )
8// expected output undefined
9
10console.log( objectArray.find(e => e.name === 'John') )
11// expected output { name: 'John' }

1const inventory = [
2  {name: 'apples', quantity: 2},
3  {name: 'cherries', quantity: 8}
4  {name: 'bananas', quantity: 0},
5  {name: 'cherries', quantity: 5}
6  {name: 'cherries', quantity: 15}
7  
8];
9
10const result = inventory.find( ({ name }) => name === 'cherries' );
11
12console.log(result) // { name: 'cherries', quantity: 5 }

1const array1 = [5, 12, 8, 130, 44];
2
3const found = array1.find(element => element > 10);
4
5console.log(found);
6// expected output: 12

1const array1 = [5, 12, 8, 130, 44];
2
3const found = array1.find(element => element > 10);
4
5console.log(found);
6// expected output: 12
7

1myArray.find(x => x.id === '45').foo;

1str.indexOf("locate"); // return location of first find value
2str.lastIndexOf("locate"); // return location of last find value
3str.indexOf("locate", 15); // start search from location 15 and then take first find value
4str.search("locate");
5//The search() method cannot take a second start position argument. 
6//The indexOf() method cannot take powerful search values (regular expressions).