javascript how to loop code example

Example 1: javascript for loop

for (var i; i < 10; i++) {
  
}

Example 2: javascript for

let str = "";

for (let i = 0; i < 9; i++) {
  str = str + i;
}

console.log(str);
// expected output: "012345678"

Example 3: javascript loop

let array = ["foo", "bar"]

let low = 0; // the index to start at
let high = array.length; // can also be a number

/* high can be a direct access too
	the first part will be executed when the loop starts 
    	for the first time
	the second part ("i < high") is the condition 
    	for it to loop over again.
    the third part will be executen every time the code 
        block in the loop is closed.
*/ 
for(let i = low; i < high; i++) { 
  // the variable i is the index, which is
  // the amount of times the loop has looped already
  console.log(i);
  console.log(array[i]); 
} // i will be incremented when this is hit.

// output: 
/*
	0
    foo
    1
    bar
*/

Example 4: javascript loops

JS Loops
for (before loop; condition for loop; execute after loop) {
// what to do during the loop
}
for
The most common way to create a loop in Javascript
while
Sets up conditions under which a loop executes
do while
Similar to the while loop, however, it executes at least once and performs a check at the end to
see if the condition is met to execute again
break
Used to stop and exit the cycle at certain conditions
continue
Skip parts of the cycle if certain conditions are met

Example 5: boucle for of javascript

let panier = ['fraise', 'banane', 'poire'];

for (const fruit of panier) {
  // console.log(fruit);
  console.log(panier.indexOf(fruit));
}