Selecting the correct JS Array Function

arrayMethods.js

let arr = [1,2,3,4,5,6,7]

// IF I WANT...

// ---- Mutate the original array ---- //

// Add to 
arr.push() // end
arr.unshift() //start

// Remove from
arr.pop() //end
arr.shift() //start
arr.splice() //any index

//Others
arr.reverse()
arr.sort()
arr.fill();


// ---- Create a new Array ---- //

arr.map() // from the original
arr.filter() // with a condition
arr.slice() // portion of original
arr.concat() //adding original to other

arr.flat() //flatten the original
arr.flatMap()

// ---- An array index ---- //
arr.indexOf() // based on value
arr.findIndex() //based on test condition


// ---- An array element ---- //
arr.find() // based on test condition

// ---- Know if array includes ---- //
arr.includes() //based on value
arr.some() //based on test condition

// ---- A new string ---- //
arr.join() // based on separator string

// ---- To transform to value ---- //
arr.reduce() // boil down to single value

// ---- To just loop array ---- //
arr.forEach() // based on callback