Angular equivalent of jQuery $.map?

问题

I'm transitioning from relying on jQuery to building apps in AngularJS. It's recommended in a number of places to not mix jQuery and Angular code.

One thing I miss though is the jQuery $.map function for arrays. I know this could be re-written using the native Javascript map function, but this is not implemented in all browsers (notably, IE < v9).

So, is there an Angular equivalent, or should I got back to writing for (var x = 0; x < foo; x += 1) {...} so I can stop including jQuery?

UPDATE Sometimes knowing what to search for is all you need. Bergie says 'look for polyfills'. Here's a reference guide (from the Modernizr crew) for a bunch of resources for making modern code work on older browsers: HTML5 Cross Browser Polyfills

回答1:

Check here: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/map

Mozilla has supplied an Array.map polyfill for unsupported browsers

if (!Array.prototype.map) {
  Array.prototype.map = function(callback, thisArg) {

    var T, A, k;

    if (this == null) {
      throw new TypeError(" this is null or not defined");
    }

    // 1. Let O be the result of calling ToObject passing the |this| value as the argument.
    var O = Object(this);

    // 2. Let lenValue be the result of calling the Get internal method of O with the argument "length".
    // 3. Let len be ToUint32(lenValue).
    var len = O.length >>> 0;

    // 4. If IsCallable(callback) is false, throw a TypeError exception.
    // See: http://es5.github.com/#x9.11
    if (typeof callback !== "function") {
      throw new TypeError(callback + " is not a function");
    }

    // 5. If thisArg was supplied, let T be thisArg; else let T be undefined.
    if (thisArg) {
      T = thisArg;
    }

    // 6. Let A be a new array created as if by the expression new Array(len) where Array is
    // the standard built-in constructor with that name and len is the value of len.
    A = new Array(len);

    // 7. Let k be 0
    k = 0;

    // 8. Repeat, while k < len
    while(k < len) {

      var kValue, mappedValue;

      // a. Let Pk be ToString(k).
      //   This is implicit for LHS operands of the in operator
      // b. Let kPresent be the result of calling the HasProperty internal method of O with argument Pk.
      //   This step can be combined with c
      // c. If kPresent is true, then
      if (k in O) {

        // i. Let kValue be the result of calling the Get internal method of O with argument Pk.
        kValue = O[ k ];

        // ii. Let mappedValue be the result of calling the Call internal method of callback
        // with T as the this value and argument list containing kValue, k, and O.
        mappedValue = callback.call(T, kValue, k, O);

        // iii. Call the DefineOwnProperty internal method of A with arguments
        // Pk, Property Descriptor {Value: mappedValue, : true, Enumerable: true, Configurable: true},
        // and false.

        // In browsers that support Object.defineProperty, use the following:
        // Object.defineProperty(A, Pk, { value: mappedValue, writable: true, enumerable: true, configurable: true });

        // For best browser support, use the following:
        A[ k ] = mappedValue;
      }
      // d. Increase k by 1.
      k++;
    }

    // 9. return A
    return A;
  };      
}

回答2:

No, there is no equivalent in Angular. And as you discovered, no you don't need to fall back to writing imperative code.

Instead, just use the map function that is built directly into JavaScript. If you need to support IE8, insert the polyfill at the beginning of your scripts.

来源：https://stackoverflow.com/questions/15411620/angular-equivalent-of-jquery-map