javascript foreach
const avengers = ['thor', 'captain america', 'hulk'];
avengers.forEach((item, index)=>{
console.log(index, item)
})javascript foreach
const avengers = ['thor', 'captain america', 'hulk'];
avengers.forEach((item, index)=>{
console.log(index, item)
})For-each over an array in JavaScript
/** 1. Use forEach and related */
var a = ["a", "b", "c"];
a.forEach(function(entry) {
console.log(entry);
});
/** 2. Use a simple for loop */
var index;
var a = ["a", "b", "c"];
for (index = 0; index < a.length; ++index) {
console.log(a[index]);
}
/**3. Use for-in correctly*/
// `a` is a sparse array
var key;
var a = [];
a[0] = "a";
a[10] = "b";
a[10000] = "c";
for (key in a) {
if (a.hasOwnProperty(key) && // These checks are
/^0$|^[1-9]\d*$/.test(key) && // explained
key <= 4294967294 // below
) {
console.log(a[key]);
}
}
/** 4. Use for-of (use an iterator implicitly) (ES2015+) */
const a = ["a", "b", "c"];
for (const val of a) {
console.log(val);
}
/** 5. Use an iterator explicitly (ES2015+) */
const a = ["a", "b", "c"];
const it = a.values();
let entry;
while (!(entry = it.next()).done) {
console.log(entry.value);
}for each js
const fruits = ['mango', 'papaya', 'pineapple', 'apple'];
// Iterate over fruits below
// Normal way
fruits.forEach(function(fruit){
console.log('I want to eat a ' + fruit)
});for each array javascript
var fruits = ["apple", "orange", "cherry"];
fruits.forEach(getArrayValues);
function getArrayValues(item, index) {
console.log( index + ":" + item);
}
/*
result:
0:apple
1:orange
2:cherry
*/forEach
const arraySparse = [1,3,,7]
let numCallbackRuns = 0
arraySparse.forEach((element) => {
console.log(element)
numCallbackRuns++
})
console.log("numCallbackRuns: ", numCallbackRuns)
// 1
// 3
// 7
// numCallbackRuns: 3
// comment: as you can see the missing value between 3 and 7 didn't invoke callback function.perform a function on each element of array javascript
var new_array = old_array.map(function(e) {
e.data = e.data.split(',');
return e;
});Copyright © 2021 Codeinu
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