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January 20, 2020 16:45
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Big O Notation Examples
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// Calculate the sum of all numbers from 1 - 10 | |
// O(n) | |
function addUpToOne(n) { | |
return n * (n +1) / 2; | |
} | |
var timeOne = performance.now(); | |
addUpToOne(10000000); | |
var timeTwo = performance.now(); | |
console.log(`Time taken 2: ${(timeTwo - timeOne) / 1000} seconds`) | |
// O(1) | |
function addUpToTwo(n) { | |
return n * (n +1) / 2; | |
} | |
var timeOne = performance.now(); | |
addUpToTwo(10000000); | |
var timeTwo = performance.now(); | |
console.log(`Time taken 2: ${(timeTwo - timeOne) / 1000} seconds`) | |
// O(n) | |
function countUpAndDown(input) { | |
for (i=0; i<= input; i++) { | |
console.log(i) | |
} | |
} | |
countUpAndDown(10); | |
// O(n^2) | |
function printAllPairs(input) { | |
for ( i = 0; i < input; i++) { | |
for (j = 0; j < input; j++) { | |
console.log(i, j) | |
} | |
} | |
} | |
printAllPairs(10); | |
// |
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