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Here is a small code part about Array Manipulating Methods in JavaScript :

Lets call bananas like b and apples like a, so :

arr[b,b,b,b].map(b=>a) --> [a,a,a,a] // We make apples from bananas ;

arr[b,b,a,b].filter(b) --> [b,b,b] // We filtered only bananas ;

arr[a,a,b,b].find(b) --> [b] // We just take bananas from Array;

arr[a,a,a,b].findIndexOf(b) --> [3] // We just find index of banana element;

arr[b,b,b,b].fill(1,a) --> [b,a,a,a] // We pull apples from index 1 to end;

arr[a,b,b,a].some(b) --> True // We checked if there are bananas in Array;

arr[b,b,b,a].every(b) --> False // We checked if there are only bananas in array.

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