javascript loop through array
const myArray = ['foo', 'bar']; myArray.forEach(x => console.log(x)); //or for(let i = 0; i < myArray.length; i++) { console.log(myArray[i]); }
javascript loop through array
const myArray = ['foo', 'bar']; myArray.forEach(x => console.log(x)); //or for(let i = 0; i < myArray.length; i++) { console.log(myArray[i]); }
javascript loop through array
array iteration styles illustrate programming paradigms let newArray = []; const theArray = [2, 4, 6, 8, 10] // 1) imperative, explicit for (var i = 0; i < theArray.length; i++) { // var is mutable console.log(theArray[i]); // side effect from writing to console newArray[i] = theArray[i] * theArray[i] // let is mutable } // 2) forEach function of the Array class TIP: console.log(Array) //Does not change the array, Returns undefined function f1(theValue, theIndex, originalArray) { numVal = numVal * theValue } theArray.forEach(f1); console.log( ` creates ${ newArray }` ); run.addEventListener("click", function () {cpeople.forEach((element) => console.log(element.firstname));}); // 3) declarative, implicit function f1(v,i,a) { v=v*v } const constArray = theArray.map(fNumbers); console.log( ` immutable ${ newArray }` );
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