swannodette/fun.js

## fun.js
var data = [0,1,2,3,4,5,6,7,8,9];

function test() {
  var result = [];
  for(var i = 0; i < data.length; i++) {
    if(data[i] % 2 == 0) {
      result.push(data[i]*2);
    }
  }

  console.log(result);

  var sum = 0;
  for(var i = 0; i < result.length; i++) {
    sum = sum + result[i];
  }

  console.log(sum);
}

function even(n) { return n % 2 == 0; };
function mul2(n) { return n * 2; };
function sum(a, b) { return a + b; };
// data.map(mul2).filter(even).reduce(sum)

function map(f, arr) {
  var result = [];
  for(var i = 0; i < arr.length; i++) {
    result.push(f(arr[i]));
  }
  return result;
}

function filter(test, arr) {
  var result = [];
  for(var i = 0; i < arr.length; i++) {
    if(test(arr[i])) {
      result.push(arr[i]);
    }
  }
  return result;
}

function not(f) {
  return function() {
    return !f.apply(null, arguments);
  };
}

function sameFirstChar(s1, s2) {
  return s1[0] == s2[0];
}

function object(x) {
  var secret = "can't see me!";
  return {
    setX: function(y) { x = y; },
    getX: function() { return x; }
  };
}

var people = [{first: "Bob", last: "Smith"},
              {first: "John", last: "Smith"},
              {first: "Mary", last: "Joe"}];

function format_name(p) {
  return p.last + ", " + p.first;
}

function last_name(p) {
  return p.last;
}

function property(prop) {
  return function(obj) {
    return obj[prop];
  };
}

/*
function lazyseq(h, f) {
  return {
    head: h,
    tail: f
  };
}

function ints(start) {
  return lazyseq(start, function() {
    return ints(start+1);
  });
}

function map(f, seq) {
  if(seq == null) return null;
  return lazyseq(f(seq.head), function() {
    return map(f, seq.tail());
  });
}

function filter(test, seq) {
  if(seq == null) return null;
  if(test(seq.head)) {
    return lazyseq(seq.head, function() {
      return filter(test, seq.tail());
    });
  }
  return filter(test, seq.tail());
}

function take(n, seq) {
  if(seq == null) return null;
  if(n == 0) return null;
  return lazyseq(seq.head, function() {
    return take(n-1, seq.tail());
  });
}

function into_array(seq) {
  var result = [];

  while(seq) {
    result.push(seq.head);
    seq = seq.tail();
  }

  return result;
}

function repeat(x) {
  return lazyseq(x, function() {
    return repeat(x);
  });
}

function interleave(s1, s2) {
  if(s1 == null) return null;
  if(s2 == null) return null;
  return lazyseq(s1.head, function() {
    return lazyseq(s2.head, function() {
      return interleave(s1.tail(), s2.tail());
    });
  });
}
*/

## index.html
<html>
  <head>
    <script type="text/javascript" src="fun.js"></script>
  </head>
</html>
	var data = [0,1,2,3,4,5,6,7,8,9];

	function test() {
	var result = [];
	for(var i = 0; i < data.length; i++) {
	if(data[i] % 2 == 0) {
	result.push(data[i]*2);
	}
	}

	console.log(result);

	var sum = 0;
	for(var i = 0; i < result.length; i++) {
	sum = sum + result[i];
	}

	console.log(sum);
	}

	function even(n) { return n % 2 == 0; };
	function mul2(n) { return n * 2; };
	function sum(a, b) { return a + b; };
	// data.map(mul2).filter(even).reduce(sum)

	function map(f, arr) {
	var result = [];
	for(var i = 0; i < arr.length; i++) {
	result.push(f(arr[i]));
	}
	return result;
	}

	function filter(test, arr) {
	var result = [];
	for(var i = 0; i < arr.length; i++) {
	if(test(arr[i])) {
	result.push(arr[i]);
	}
	}
	return result;
	}

	function not(f) {
	return function() {
	return !f.apply(null, arguments);
	};
	}

	function sameFirstChar(s1, s2) {
	return s1[0] == s2[0];
	}

	function object(x) {
	var secret = "can't see me!";
	return {
	setX: function(y) { x = y; },
	getX: function() { return x; }
	};
	}

	var people = [{first: "Bob", last: "Smith"},
	{first: "John", last: "Smith"},
	{first: "Mary", last: "Joe"}];

	function format_name(p) {
	return p.last + ", " + p.first;
	}

	function last_name(p) {
	return p.last;
	}

	function property(prop) {
	return function(obj) {
	return obj[prop];
	};
	}

	/*
	function lazyseq(h, f) {
	return {
	head: h,
	tail: f
	};
	}

	function ints(start) {
	return lazyseq(start, function() {
	return ints(start+1);
	});
	}

	function map(f, seq) {
	if(seq == null) return null;
	return lazyseq(f(seq.head), function() {
	return map(f, seq.tail());
	});
	}

	function filter(test, seq) {
	if(seq == null) return null;
	if(test(seq.head)) {
	return lazyseq(seq.head, function() {
	return filter(test, seq.tail());
	});
	}
	return filter(test, seq.tail());
	}

	function take(n, seq) {
	if(seq == null) return null;
	if(n == 0) return null;
	return lazyseq(seq.head, function() {
	return take(n-1, seq.tail());
	});
	}

	function into_array(seq) {
	var result = [];

	while(seq) {
	result.push(seq.head);
	seq = seq.tail();
	}

	return result;
	}

	function repeat(x) {
	return lazyseq(x, function() {
	return repeat(x);
	});
	}

	function interleave(s1, s2) {
	if(s1 == null) return null;
	if(s2 == null) return null;
	return lazyseq(s1.head, function() {
	return lazyseq(s2.head, function() {
	return interleave(s1.tail(), s2.tail());
	});
	});
	}
	*/
	<html>
	<head>
	<script type="text/javascript" src="fun.js"></script>
	</head>
	</html>