TruncateSync method in node.js

Method description:

Synchronous version (link: #), file content interception operation.

Grammar:

fs.truncateSync(path, len)

Since this method belongs to the fs module, the fs module (var fs= require(" fs ")) needs to be introduced before use.

Receiving parameters:

Path                    The file path

Len                          Truncate the length, leaving only the characters within the length of the character, and the excess will be cleared.

Example:

var fs = require('fs');

fs.truncateSync('126.txt', 3);

Source:

fs.truncateSync = function(path, len) {

  if (util.isNumber(path)) {

    // legacy

    return fs.ftruncateSync(path, len);

  }

  if (util.isUndefined(len)) {

    len = 0;

  }

  // allow error to be thrown, but still close fd.

  var fd = fs.openSync(path, 'r+');

  try {

    var ret = fs.ftruncateSync(fd, len);

  } finally {

    fs.closeSync(fd);

  }

  return ret;

};