BellaZook

For Loop
For In
While Loop
Do While

For Loop

for (initialExpression;condition;incrementExpression;) {"do something until condition is met"
}

const forLoop = () => {const MAX_LENGTH = 10;
// Runs 10 times, 
for ( let index = 0;index < MAX_LENGTH;index++;) {// start values = 0; end value = MAX_LENGTH - 1 = 9; increment by 1;
console.log(index)
}
}
// Output: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

For In

Loop through all the properties of an object.

Avoid using "For in" in arrays, you might get unexpected results. Use "For of" instead.

Will include "Array.prototype" in the result
Will ignore undefinted indexes in the array

for (variableinobject) {for each propertie in object, do something
}

const home = {model:"A36", rooms:"6", price:"2Mil", location:"Holliwood"};
let properties = "";
for (let propertyIndexinperson) {properties += home[propertyIndex] + " ";
}
console.log(properties)
// Output: "A36 6 2Mil Holliwood"

While Loop

To prevent an infinite loop, make sure that the condition eventualy becomes false

Declear and set variable used in the wile loop condition
while (condition) {"do something until condition is met"
increment variable to move towards condition
}

let i = 0;
while (i < 10) {console.log(i);
i++;
}
// Output: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Do While Loop

Statement is always executed once before the condition is checked

Declear and set variable used in the wile loop condition
do {increment variable to move towards condition
"do something until condition is met"
} while (condition);

let i = 0;
do {i += 1;
console.log(i);
} while (i < 5);

References

MDN - Loops and iteration