Source code
Revision control
Copy as Markdown
Other Tools
with ({}); // Don't inline anything into the top-level script.
function args() { return arguments; }
for (let xs of [
// Array
[[], [1, 2, 3]],
// String
["", "asdf"],
// ArrayBufferView
[new Int32Array(0), new Int32Array(10)],
// Arguments
[args(), args(1, 2, 3)],
]) {
for (let cst of [0, -1]) {
// Fold `Math.min(length ≥ 0, constant ≤ 0)` to `constant`.
let min = Function("x", `return Math.min(x.length, ${cst})`);
for (let i = 0; i < 100; ++i) {
let x = xs[i & 1];
assertEq(min(x), cst);
}
// Reverse operands.
min = Function("x", `return Math.min(${cst}, x.length)`);
for (let i = 0; i < 100; ++i) {
let x = xs[i & 1];
assertEq(min(x), cst);
}
// Fold `Math.max(length ≥ 0, constant ≤ 0)` to `length`.
let max = Function("x", `return Math.max(x.length, ${cst})`);
for (let i = 0; i < 100; ++i) {
let x = xs[i & 1];
assertEq(max(x), x.length);
}
// Reverse operands.
max = Function("x", `return Math.max(${cst}, x.length)`);
for (let i = 0; i < 100; ++i) {
let x = xs[i & 1];
assertEq(max(x), x.length);
}
}
}