Array#grep

gistfile1.js

// javascript 1.6 以上だと filteredArray = array.filter(callback[, thisObject]) を使うといい。
// 使えない場合に grep を実装する
//
// var FuncOfGrepRule = function (itemOfArray) {
//     return (itemOfArray.match(/condition/)) ? true : false;
// });
//
// var newArray = orgArray.grep(FuncOfGrepRule);
// 

if (! Array.prototype.grep) {
    Array.prototype.grep = function (func) {
        if (typeof func !== 'function') throw new Error('1st argument must be "function"');

        var that = this.slice(0), len = that.length;

        for (len--; len >= 0; len--) {
            if (! func(that[len], len)) that.splice(len, 1);
        }

        return (that.length === 0) ? undefined : that;
    };
}

var org = ("pretty dog prenty doll home drug github ben harper").split(/\s+/);

console.log('元の配列');
console.log(JSON.stringify(org));

var greped = org.grep(function (_item) {
    return (_item.match(/do/i));
});

console.log('grepした配列');
console.log(JSON.stringify(greped));
console.log('元の配列');
console.log(JSON.stringify(org));

var ORG = [
    { mak : 'abc' },
    { mak : 'def' },
    { mak : 'GHI' },
    { mak : 'JKL' }
];

var GREPED = ORG.grep(function (hash) {
    return (hash['mak'].match(/e|h/i));
});

console.log(JSON.stringify(GREPED));