Javascript/jQuery中的Python部分等效 [英] Python partial equivalent in Javascript / jQuery

问题描述

Python中 functools.partial 的等效项是什么? Javascript还是jQuery?

What is the equivalent for Pythons functools.partial in Javascript or jQuery ?

推荐答案

也许是这样的.这有点棘手，因为javascript没有像python这样的命名参数，但是该函数非常接近.

Something like this perhaps. It is a little bit tricky as javascript doesn't have named arguments like python, but this function comes pretty close.

function partial() {
  var args = Array.prototype.slice.call(arguments);
  var fn = args.shift();
  return function() {
    var nextArgs = Array.prototype.slice.call(arguments);
    // replace null values with new arguments
    args.forEach(function(val, i) {
      if (val === null && nextArgs.length) {
        args[i] = nextArgs.shift();
      }
    });
    // if we have more supplied arguments than null values
    // then append to argument list
    if (nextArgs.length) {
      nextArgs.forEach(function(val) {
        args.push(val);
      });
    }
    return fn.apply(fn, args);
  }
}

// set null where you want to supply your own arguments
var hex2int = partial(parseInt, null, 16);
document.write('<pre>');
document.write('hex2int("ff") = ' + hex2int("ff") + '\n');
document.write('parseInt("ff", 16) = ' + parseInt("ff", 16));
document.write('</pre>');

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