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291 lines (176 loc) · 5.32 KB
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// Array Traversal (Accessing Array Elements)
var numbers = [1,2,3,4,5,6,"shsjshk"];
let target = 5 ;
function findTargetIndex(array,target){
for(let i = 0 ; i<array.length; i++)
{
console.log(i,array[i]);
}
}
findTargetIndex(numbers,target)
// Linear Search
var numbers = [1,2,3,4,5,6];
let target = 1 ;
function findTargetIndex(array,target){
let foundIndex = false;
for(let i = 0 ; i<array.length; i++)
{
// console.log(i,array[i]);
if(array[i]===target){
foundIndex = true;
return(i);
}
}
if(foundIndex === false){
return-1
}
}
console.log(findTargetIndex(numbers,target))
binary approach
// Finding Middle Element
var numbers = [1,2,3,4,5,6];
let target = 1 ;
function findTargetIndex(array,target){
// console.log(numbers.length/2)
let middleIndex = array.length / 2;
let middleElement = array[middleIndex];
return {middleIndex,middleElement};
}
console.log(findTargetIndex(numbers,target))
// Middle Element using Math.floor()
var numbers = [1,2,3,4,5,6];
let target = 1 ;
function findTargetIndex(array,target){
// console.log(numbers.length/2)
let middleIndex = Math.floor(array.length /2);
let middleElement = array[middleIndex];
if(target===middleElement){
return middleIndex;
}
if(target > middleElement){
console.log("target is greater than middleelement");
}
if (target <middleElement){
console.log("target is smaller than middleelement")
}
return {middleIndex,middleElement};
}
console.log(findTargetIndex(numbers,target))
// Binary Search on Odd Length Array
var numbers = [1,2,3];
let target = 1 ;
function findTargetIndex(array,target){
// console.log(numbers.length/2)
let middleIndex = Math.floor(array.length /2);
let middleElement = array[middleIndex];
if(target===middleElement){
return middleIndex;
}
if(target > middleElement){
console.log("target is greater than middleelement");
}
if (target <middleElement){
console.log("target is smaller than middleelement")
}
return {middleIndex,middleElement};
}
console.log(findTargetIndex(numbers,target))
// Binary Search on Single Element Array
var numbers = [1];
let target = 1 ;
function findTargetIndex(array,target){
// console.log(numbers.length/2)
let middleIndex = Math.floor(array.length /2);
let middleElement = array[middleIndex];
if(target===middleElement){
return middleIndex;
}
if(target > middleElement){
console.log("target is greater than middleelement");
}
if (target <middleElement){
console.log("target is smaller than middleelement")
}
return {middleIndex,middleElement};
}
console.log(findTargetIndex(numbers,target))
// Binary Search using Left and Right Pointer
var numbers = [1,2,3,4,5,6];
let target = 1;
function findTargetIndex(array, target) {
let left = 0;
let right = array.length - 1;
let middleIndex = Math.ceil((left + right) / 2);
let middleElement = array[middleIndex];
if (target === middleElement) {
return middleIndex;
}
if (target > middleElement) {
console.log("target is greater than middleelement");
}
if (target < middleElement) {
console.log("target is smaller than middleelement");
right = middleIndex - 1;
console.log(right, "right");
}
return {
middleIndex,
middleElement
};
}
console.log(findTargetIndex(numbers, target));
// Binary Search using While Loop
var numbers = [1,2,3,4,5,6];
let target = 6;
function findTargetIndex(array, target) {
let left = 0;
let right = array.length - 1;
while(left<= right)
{
let middleIndex = Math.ceil((left + right) / 2);
let middleElement = array[middleIndex];
console.log(middleElement,"middleElement");
if (target === middleElement) {
return middleIndex;
}
else if (target > middleElement) {
console.log("target is greater than middleelement");
left =middleIndex +1;
}
else if (target < middleElement) {
console.log("target is smaller than middleelement");
right = middleIndex - 1;
}
}
}
console.log(findTargetIndex(numbers, target));
// Binary Search with Dry Run (Tracing Each Iteration)
var numbers = [1,2,3,4,5,6];
let target = 5;
function findTargetIndex(array, target) {
let left = 0;
let right = array.length - 1;
while(left<= right)
{
let middleIndex = Math.ceil((left + right) / 2);
console.log(middleIndex,"middleIndex")
let middleElement = array[middleIndex];
console.log(middleElement,"middleElement");
if (target === middleElement) {
return middleIndex;
}
else if (target > middleElement) {
console.log("target is greater than middleelement");
left =middleIndex +1;
}
else if (target < middleElement) {
console.log("target is smaller than middleelement");
right = middleIndex - 1;
}
}
}
console.log(findTargetIndex(numbers, target));
// JavaScript Math Methods (Math.ceil() and Math.floor())
// console.log(2.5);
// console.log(Math.ceil(2.5));
// console.log(Math.floor(2.5));