A for loop repeats until a specified condition evaluates to false.
\nfor ([initialization]; [condition]; [final-expression]) {\n statement\n}Initialization: Typically used to initialize a counter variable.
\nCondition: An expression to be evaluated before each loop iteration.
\nFinal-expression: Generally used to increment the counter variable.
\nfor (let i = 0; i < 5; i++) {\n console.log(i)\n}// output\n0\n1\n2\n3\n4The for...each method executes a provided function once for each array element.
// Arrow function\n\nforEach((element) => { ... } )\n\nforEach((element, index) => { ... } )\n\nforEach((element, index, array) => { ... } )element: The current element being processed in the array
\nindex(optional): The index of the element in the array.
\narray(optional): The array for...each was called upon.
const team = ["Sam", "Alex", "Cathy"]\n\nteam.forEach(teamMember => console.log(`Hello ${teamMember}`))// output\n\nHello Sam\nHello Alex\nHello Cathyconst nums = ["10", "20", "30"]\n\nnums.forEach((num, index, arr) => (arr[index] = num * 2))\n\nconsole.log(nums)// output\n\n[ 20, 40, 60 ]Used to loop through the properties of an object.(It iterates through the properties in an arbitrary order.)
\nDon’t use for...in loop to iterate over an Array where the index order is important.
for (variable in object) {\n statement\n}const object = {\n firstName: "Hemanta",\n lastName: "Sundaray",\n}\n\nfor (key in object) {\n console.log(`${object[key]}`)\n}// output\n\nHemanta\nSundarayUsed to loop over iterable objects. (Arrays, strings, Maps, Sets etc.).
\nfor (variable of iterable) {\n statement\n}const numbers = [10, 20, 30]\n\nfor (const number of numbers) {\n console.log(number * 2)\n}//outout\n\n20\n40\n50const lastName = "sundaray"\n\nlet fullName = "Hemanta "\n\nfor (letter of lastName) {\n fullName += letter\n}\n\nconsole.log(fullName)//output\n\nHemanta Sundaray