js for each character in string
for (var i = 0; i < str.length; i++) {
alert(str.charAt(i));
}js for each character in string
for (var i = 0; i < str.length; i++) {
alert(str.charAt(i));
}javascript loop through string
for (var i = 0; i < str.length; i++) {
console.log(str.charAt(i));
}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);
}string foreach javascript
//for
str='hello'
for (var i = 0; i < str.length; i++) {
console.info(str[i]);
}
//for...of
let result1 = '';
for (let letter of str) {
result1 += letter;
}
console.log(`for...of : ${result1}`)
//forEach
// ES6 version.
let result2 = '';
str.split('').forEach(letter => {
result2 += letter;
});
console.log(`forEach ES6 : ${result2}`)
//or
var result3 = '';
str.split('').forEach(function(letter) {
result3 += letter;
});
console.log(`forEach standard : ${result3}`)
//for...in
var result4 = '';
for (var letterIndex in str) {
result4 += str[letterIndex];
}
console.log(`for...in : ${result4}`)
//map
// ES6 version.
var result5 = '';
str.split('').map(letter => {
result5 += letter;
});
console.log(`map ES6 : ${result5}`)
//or
let result6 = '';
str.split('').map(function(letter) {
result6 += letter;
});
console.log(`map standard : ${result6}`)Copyright © 2021 Codeinu
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