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/**
@function _.uniqObjects
@require Underscore.js and json.stringify
@purpose return an array of objects without duplicated objects.
*/
_.uniqObjects=function( arr ){return _.uniq( _.collect( arr,function( x ){return JSON.stringify( x );}));};
/**
@function _.uniqObjects
@require Underscore.js and json.stringify
@purpose return an array of objects without duplicated objects.
*/
_.uniqObjects = function( arr ){
return _.uniq( _.collect( arr, function( x ){
return JSON.stringify( x );
}));
};
Example:
var foo =[{"a":"1"},{"b":"2"},{"a":"1"}];
_.uniqObject( foo );// returns [ { "a" : "1" }, { "b" : "2" } ]
var foo = [ { "a" : "1" }, { "b" : "2" }, { "a" : "1" } ];
_.uniqObject( foo ); // returns [ { "a" : "1" }, { "b" : "2" } ]
I love to program, and discover new tech.
Check out my <a href="http://stackoverflow.com/users/527776/larry-battle">stackoverflow</a> and <a href="https://github.com/LarryBattle">github</a> accounts.
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In javascript, Number.prototype.toFixed has problems rounding.
Here’s the fix and some test cases.
Number.prototype.toFixed=(function(){var oldToFixed =Number.prototype.toFixed;returnfunction(precision){var value =this.toString(), power =Math.pow(10, precision ||0);return oldToFixed.call((Math.round(value * power)/ power), precision);};}());
Number.prototype.toFixed = (function () {
var oldToFixed = Number.prototype.toFixed;
return function (precision) {
var value = this.toString(), power = Math.pow(10, precision || 0);
return oldToFixed.call((Math.round(value * power) / power), precision);
};
}());
Here’s a simple test.
// Programmer: Larry Battle// Link: http://bateru.com/news/2012/03/code-of-the-day-fix-for-number-prototype-tofixed(function(root){"use strict";var log =function( str ){
root.document.body.innerHTML+="log: "+ str +"<br/>";},
assert =function(a, b ){var message = a +' !== '+ b;
message +=( a === b )?"=> true":"=> false";
log( message );};
assert((0.595).toFixed(2),"0.59");
assert((0.9).toFixed(0),"1");Number.prototype.toFixed=(function(){var oldToFixed =Number.prototype.toFixed;returnfunction(precision){var value =this.toString(), power =Math.pow(10, precision ||0);return oldToFixed.call((Math.round(value * power)/ power), precision);};}());
log("Applying the toFixed fix.");
assert((0.595).toFixed(2),"0.60");
assert((0.9).toFixed(0),"1");}(this));
// Programmer: Larry Battle
// Link: http://bateru.com/news/2012/03/code-of-the-day-fix-for-number-prototype-tofixed
(function (root) {
"use strict";
var log = function( str ){
root.document.body.innerHTML += "log: " + str + "<br/>";
},
assert = function (a, b ) {
var message = a + ' !== ' + b;
message += ( a === b ) ? "=> true" : "=> false";
log( message );
};
assert((0.595).toFixed(2), "0.59");
assert((0.9).toFixed(0), "1");
Number.prototype.toFixed = (function () {
var oldToFixed = Number.prototype.toFixed;
return function (precision) {
var value = this.toString(), power = Math.pow(10, precision || 0);
return oldToFixed.call((Math.round(value * power) / power), precision);
};
}
());
log("Applying the toFixed fix.");
assert((0.595).toFixed(2), "0.60");
assert((0.9).toFixed(0), "1");
}(this));
I love to program, and discover new tech.
Check out my <a href="http://stackoverflow.com/users/527776/larry-battle">stackoverflow</a> and <a href="https://github.com/LarryBattle">github</a> accounts.
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ParseInt returns 1 for when passed any number greater or equal to 1e+21.
var x = 1.0e+2;
console.log( x == 1e+2 );
console.log( parseInt( x,10)==100);
console.log( parseFloat( x )==100);var x = 1.0e+21;
console.log( x == 1e+21 );
console.log( parseInt( x,10)==1);
console.log( parseFloat( x )== 1e+21 );
var x = 1.0e+2;
console.log( x == 1e+2 );
console.log( parseInt( x, 10 ) == 100 );
console.log( parseFloat( x ) == 100 );
var x = 1.0e+21;
console.log( x == 1e+21 );
console.log( parseInt( x, 10 ) == 1 );
console.log( parseFloat( x ) == 1e+21 );
What do you think the problem is?
I think the problem by be because numbers 1e+21 and greater are represented as strings.
ParseInt might only be looking at valid numbers to parse the number to into an integer. Since e in ‘1e21’ is not a number, 1 is the item returned.
I love to program, and discover new tech.
Check out my <a href="http://stackoverflow.com/users/527776/larry-battle">stackoverflow</a> and <a href="https://github.com/LarryBattle">github</a> accounts.
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A few days ago I noticed that my “code of the day” article was wrong. So I spent some time fixing it and provided test cases to check my work.
The main difference about this script is that it allows you to support both the SI and IEC standard and fixes a few rounding errors.
// function: getBytesWithUnit// input: bytes (number)// input: useSI (boolean), if true then uses SI standard (1KB = 1000bytes), otherwise uses IEC (1KiB = 1024 bytes)// input: precision (number), sets the maximum length of decimal places.// input: useSISuffix (boolean), if true forces the suffix to be in SI standard. Useful if you want 1KB = 1024 bytes// returns (string), represents bytes is the most simplified form.var getBytesWithUnit =function(bytes, useSI, precision, useSISuffix){"use strict";if(!(!isNaN(bytes)&&+bytes >-1&& isFinite(bytes))){returnfalse;}var units, obj, amountOfUnits, unitSelected, suffix;
units =['bytes','KB','MB','GB','TB','PB','EB','ZB','YB'];
obj ={
base : useSI ?10:2,
unitDegreeDiff : useSI ?3:10};
amountOfUnits =Math.max(0,Math.floor(Math.round(Math.log(+bytes)/Math.log(obj.base)* 1e6)/ 1e6));
unitSelected =Math.floor(amountOfUnits / obj.unitDegreeDiff);
unitSelected = units.length> unitSelected ? unitSelected : units.length-1;
suffix =(useSI || useSISuffix)? units[unitSelected]: units[unitSelected].replace('B','iB');
bytes =+bytes /Math.pow(obj.base, obj.unitDegreeDiff* unitSelected);
precision = precision ||3;if(bytes.toString().length> bytes.toFixed(precision).toString().length){
bytes = bytes.toFixed(precision);}return bytes +" "+ suffix;};
// function: getBytesWithUnit
// input: bytes (number)
// input: useSI (boolean), if true then uses SI standard (1KB = 1000bytes), otherwise uses IEC (1KiB = 1024 bytes)
// input: precision (number), sets the maximum length of decimal places.
// input: useSISuffix (boolean), if true forces the suffix to be in SI standard. Useful if you want 1KB = 1024 bytes
// returns (string), represents bytes is the most simplified form.
var getBytesWithUnit = function (bytes, useSI, precision, useSISuffix) {
"use strict";
if (!(!isNaN(bytes) && +bytes > -1 && isFinite(bytes))) {
return false;
}
var units, obj, amountOfUnits, unitSelected, suffix;
units = ['bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
obj = {
base : useSI ? 10 : 2,
unitDegreeDiff : useSI ? 3 : 10
};
amountOfUnits = Math.max(0, Math.floor(Math.round(Math.log(+bytes) / Math.log(obj.base) * 1e6) / 1e6));
unitSelected = Math.floor(amountOfUnits / obj.unitDegreeDiff);
unitSelected = units.length > unitSelected ? unitSelected : units.length - 1;
suffix = (useSI || useSISuffix) ? units[unitSelected] : units[unitSelected].replace('B', 'iB');
bytes = +bytes / Math.pow(obj.base, obj.unitDegreeDiff * unitSelected);
precision = precision || 3;
if (bytes.toString().length > bytes.toFixed(precision).toString().length) {
bytes = bytes.toFixed(precision);
}
return bytes + " " + suffix;
};
Demo: Test Script here
Want to learn more about Javascript?
Check out this “Professional JavaScript for Web Developers”.
I love to program, and discover new tech.
Check out my <a href="http://stackoverflow.com/users/527776/larry-battle">stackoverflow</a> and <a href="https://github.com/LarryBattle">github</a> accounts.
