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June 19, 2023 07:40
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,56 @@ 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