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Last Updated: 1/24/2026
Valid Expressions Test
This document tests that VALID JavaScript expressions still work in lenient MD mode.
Simple Math Expressions
The answer is {40 + 2}.
Pi is approximately {Math.PI.toFixed(4)}.
Two squared is {2 ** 2}.
String Expressions
{“Hello, World!”}
{“Multiple ” + “strings ” + “concatenated”}
{Template literal with ${1 + 1}}
Boolean Expressions
Is 5 greater than 3? {5 > 3 ? “Yes” : “No”}
{true && “This shows”}
{false || “Fallback value”}
Array Operations
{[1, 2, 3].join(”, ”)}
{[“apple”, “banana”, “cherry”].length} fruits
{[1, 2, 3, 4, 5].filter(n => n > 2).join(”, ”)}
Object Access
{{ name: “John”, age: 30 }.name}
{Object.keys({ a: 1, b: 2, c: 3 }).length} keys
Function Calls
{Math.max(1, 5, 3)}
{Math.min(10, 20, 5)}
{“hello”.toUpperCase()}
{JSON.stringify({ key: “value” })}
Date Operations
{new Date().getFullYear()}
{new Date().toLocaleDateString()}
Ternary Operators
{1 + 1 === 2 ? “Math works!” : “Math is broken”}
{typeof “string” === “string” ? “It’s a string” : “Not a string”}
Nullish Coalescing
{null ?? “default value”}
{undefined ?? “fallback”}
Optional Chaining Style
{({ nested: { value: 42 } }).nested.value}
Complex Expressions
{(() => { const x = 10; const y = 20; return x + y; })()}
Array Methods
{[1, 2, 3].map(n => n * 2).join(”, ”)}
{[1, 2, 3, 4, 5].reduce((a, b) => a + b, 0)}
{[“a”, “b”, “c”].includes(“b”) ? “Found” : “Not found”}