- Tags: Conditional, JS Operator
- Categories: JavaScript Operators, JavaScript Reference, Reference
Quick Reference
The ternary (conditional) operator assigns a value to a variable based on a condition.
The ternary contains three parts: the test (my_age >= 18) followed by a ?, and then the two output items separated by a :. The first output item is used if the test is true and the second if the test is false.
// variables
let my_age = 54;
let voting_age = '';
// conditional
voting_age = (my_age >= 18) ? 'Pass':'Fail';
// output to HTML element
document.getElementById('my_output').innerHTML = voting_age;
Output
Pass
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JAVASCRIPT NOTES:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
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