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Copy pathdata.js
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76 lines (69 loc) · 1.6 KB
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/**
* @typedef {"string"|"object"|"arraybuffer"|"blob"} RandomDataType
*/
/**
* @param {RandomDataType} type
* @param {number} len
* @param {number} datumSize
*/
export function randomData(type, len, datumSize) {
return Array.from({length: len}).map(() => randomDatum(type, datumSize));
}
/**
* @param {RandomDataType} type
* @param {number} len
*/
function randomDatum(type, len) {
if (type == 'string') {
return randomString(len);
} else if (type == 'object') {
return randomObject(len);
} else if (type == 'arraybuffer') {
return randomUint8Array(len).buffer;
} else if (type == 'blob') {
return randomBlob(len);
} else {
throw new Error('unsupported');
}
}
/**
* @param {number} len
* @returns {Record<string, string>}
*/
function randomObject(len) {
const ret = /** @type Record<string, string> */ ({});
for (let i = 0; i < Math.min(100, len); i++) {
ret[`k${i}`] = randomString(Math.ceil(len / 100));
}
return ret;
}
/**
* @param {number} numStrings
* @param {number} strLen
*/
export function makeRandomStrings(numStrings, strLen) {
return Array.from({length: numStrings}, () => randomString(strLen));
}
/**
* @param {number} len
*/
function randomString(len) {
const arr = randomUint8Array(len);
return new TextDecoder('ascii').decode(arr);
}
/**
* @param {number} len
*/
function randomBlob(len) {
return new Blob([randomUint8Array(len)]);
}
/**
* @param {number} len
*/
function randomUint8Array(len) {
const arr = new Uint8Array(len);
for (let i = 0; i < len; i++) {
arr[i] = Math.floor(Math.random() * 254 + 1);
}
return arr;
}