typed-arrays.js - mozsearch

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load(libdir + "asserts.js");

var LENGTH = 1024, SYMBOL_INDEX = 999;

var big = [];

for (var i = 0; i < LENGTH; i++)

    big[i] = (i === SYMBOL_INDEX ? Symbol.for("comet") : i);

var progress;

function copy(arr, big) {

    for (var i = 0; i < LENGTH; i++) {

        arr[i] = big[i];

        progress = i;

for (var T of [Uint8Array, Uint8ClampedArray, Int16Array, Float32Array]) {

    // Typed array constructors convert symbols using ToNumber, which throws.

    assertThrowsInstanceOf(() => new T(big), TypeError);

    // Element assignment does the same.

    var arr = new T(big.length);

    for (var k = 0; k < 3; k++) {

        progress = -1;

        assertThrowsInstanceOf(() => copy(arr, big), TypeError);

        assertEq(progress, SYMBOL_INDEX - 1);

        assertEq(arr[SYMBOL_INDEX], 0);