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Added method iterators for string and array. Began documenation.
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@KrisJordan
KrisJordan committed Feb 22, 2012
1 parent c7c8726 commit 0bf4242
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17 changes: 10 additions & 7 deletions f_underscore-min.js
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150 changes: 138 additions & 12 deletions f_underscore.js
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,12 @@
f_.I =
f_.i = _.identity;

// More aliases.
var ArrayProto = Array.prototype,
ObjProto = Object.prototype,
StringProto = String.prototype,
FuncProto = Function.prototype;

// Given two arrays of same length, one with strings/keys, the other with values,
// return an object comprised of the keys and values.
f_.zipObject = function(keys, props) {
Expand All @@ -43,6 +49,28 @@
return result;
};

// Given two arrays return an array of all permutations of one item selected
// from each array.
// TODO: test, add multiple arg support
f_.permute = function(l, r) {
if(l.length === 0 && r.length > 0) {
var temp = r;
r = l;
l = temp;
}
var result = [];
for(var i = 0; i < l.length; i++) {
if(r.length > 0) {
for(var j = 0; j < r.length; j++) {
result.push([l[i], r[j]]);
}
} else {
result.push([l[i]]);
}
}
return result;
};

// Given a function `f`, fill in arguments `Af` without calling `f`. Returns a new
// function `p`. When `p` is called with argumens `Ap`, function `f` is called with
// a concatenation of `Af` and `Ap` for arguments.
Expand Down Expand Up @@ -71,6 +99,31 @@
};
};

// TODO: Document, test, and decide whether to keep.
f_.apply = function(fn) {
return function(obj) {
return fn.apply(obj, arguments);
};
};

f_.applyFunction = function(obj) {
return function(fn) {
return fn.apply(obj, arguments);
};
};

f_.call = function(fn) {
return function(obj) {
return fn(obj);
};
};

f_.callFunction = function(obj) {
return function(fn) {
return fn(obj);
};
};

// Iterator Function Generators
// -------------------

Expand All @@ -89,6 +142,14 @@
};
};

// Get a property, use it to call the iterator
f_.getSet = function(prop, iterator) {
return function(obj) {
obj[prop] = iterator(obj[prop]);
return obj;
};
};

// Make a function that will return the value of the specified object's
// property when invoked with a property.
f_.getByProperty = function(obj) {
Expand Down Expand Up @@ -126,6 +187,67 @@
};
};

// Make a function that will call `fn` bound to the object the iterator
// is invoked with.
f_.bindFunction = function(fn) {
var args = _.map(_.rest(arguments), f_.functionize);
return function(item) {
return fn.apply(item, _.map(args, f_.callFunction(item)));
};
};

// Binary Method
f_.bindMethod = function(method) {
var args = _.map(_.rest(arguments), f_.functionize);
return function(obj) {
var argVals = _.map(args, f_.callFunction(obj));
// Support calling method in a binary expression sense
if(!obj[method]) {
obj = _.first(argVals);
argVals = _.rest(argVals);
}
return obj[method].apply(obj, argVals);
};
};

// ### Methods Iterators
var methods = [
// Array
'pop',
'push',
'reverse',
'shift',
'sort',
'splice',
'unshift',
'join',

// String
'charAt',
'charCodeAt',
'match',
'replace',
'search',
'split',
'substr',
'substring',
'toLowerCase',
'toUpperCase',

// Common
'concat',
'indexOf',
'lastIndexOf',
'slice'
];
_.extend(f_, f_.zipObject(
methods,
_.map(methods, function(fn) {
return f_.partial(f_.bindMethod, fn);
})
)
);

// ### Expressions

// Unary Expression Template
Expand Down Expand Up @@ -179,7 +301,8 @@
negate = function(l) { return l * -1; },

// String
append = function(l, r) { return "" + l + r; }
append = function(l, r) { return (''+l).concat(r); }
prepend = function(l, r) { return (''+r).concat(l); }

// Relational
greaterThan = function(l, r) { return l > r; },
Expand Down Expand Up @@ -208,11 +331,11 @@
// ### Expression Iterators

// Unary
f_.incr = f_.increment = f_.partial(f_.unaryExpr, increment);
f_.decr = f_.decrement = f_.partial(f_.unaryExpr, decrement);
f_.sqr = f_.square = f_.partial(f_.unaryExpr, square);
f_.not = f_.partial(f_.unaryExpr, not);
f_.neg = f_.negate = f_.partial(f_.unaryExpr, negate);
f_.incr = f_.increment = f_.partial(f_.unaryExpr, increment);
f_.decr = f_.decrement = f_.partial(f_.unaryExpr, decrement);
f_.sqr = f_.square = f_.partial(f_.unaryExpr, square);
f_.not = f_.partial(f_.unaryExpr, not);
f_.neg = f_.negate = f_.partial(f_.unaryExpr, negate);

// Binary
f_.add = f_.partial(f_.binaryExpr, add);
Expand All @@ -221,7 +344,13 @@
f_.div = f_.divide = f_.partial(f_.binaryExpr, divide);
f_.mod = f_.modulo = f_.partial(f_.binaryExpr, modulo);

f_.concat = f_.append = f_.partial(f_.binaryExpr, append);
// String
f_.append = f_.partial(f_.binaryExpr, append);
f_.prepend = f_.partial(f_.binaryExpr, prepend);

// Relational
f_.eq = f_.isEqual = f_.partial(f_.binaryExpr, equality);
f_.neq = f_.isNotEqual = f_.partial(f_.binaryExpr, inequality);

f_.gt = f_.greaterThan = f_.partial(f_.binaryExpr, greaterThan);
f_.gte = f_.atLeast = f_.partial(f_.binaryExpr, atLeast);
Expand All @@ -231,16 +360,14 @@
f_.greaterOf = f_.partial(f_.binaryExpr, greaterOf);
f_.lesserOf = f_.partial(f_.binaryExpr, lesserOf);

f_.eq = f_.equality = f_.partial(f_.binaryExpr, equality);
f_.neq = f_.inequality = f_.partial(f_.binaryExpr, inequality);

// Logical
f_.and = f_.partial(f_.binaryExpr, and);
f_.neither = f_.partial(f_.binaryExpr, neither);
f_.or = f_.partial(f_.binaryExpr, or);
f_.xor = f_.partial(f_.binaryExpr, xor);

// Ternary
f_.ternary = f_.partial(f_.ternaryExpr, ternary);
f_.ternary = f_.ifThenElse = f_.partial(f_.ternaryExpr, ternary);

// ### Reducer Iterators

Expand All @@ -262,7 +389,6 @@
f_.min = f_.partial(f_.reduceExpr, lesserOf);
f_.max = f_.partial(f_.reduceExpr, greaterOf);

f_.avg =
f_.average = function(f_v) {
var count = 1;
var expr = function(l, r) {
Expand Down
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