loops

Concept

Used when repeasting an action
Beware of conditions that can result in an infinite loop

For loops

• repeating a task x number of times
• initialise an incrementer, check if condition is true, run the loop body, increment, check if the condition is still true, repeat

for(initialiser; condition; increment) {
	// body
}

for(let i = 0; i <= 5; i = i + 1) {
	// body
}

While loops

• for repeating a task until a condition is met
• check if condition is true, run the loop body, check if condition is still true, repeat

while(condition) { 
	// body
}

while(true) {
	// body
}

Application

Loops in math

let sum = 0;
for(i = 0; i <= 4; i = i + 1) {
	sum = sum + i; // summation
}
sum; // -> 10

let prod = 1;
for(i = 1; i <= 4; i = i + 1) {
	prod = prod * i;
}
prod; // -> 24