[英]Sum all properties in object
我有以下对象:
{"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"}
我想总结所有这些值并打印出来。 如何总结属性值? :)
for(var in)
迭代对象属性parseInt
因为一些整数是字符串形式 var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"}; var sum = 0; for(var key in obj){ sum += parseInt(obj[key]); } document.write(sum);
这是使用 ES5 的Object.keys和reduce的一种方法:
var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"}; var sum = Object.keys(obj).reduce(function(prev, current, index) { return prev + (+obj[current]); }, 0); console.log(sum); // 746
我的 for-less 版本:
var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"}; function sumProperties(obj) { return Object.getOwnPropertyNames(obj) .map(function(item){ return +obj[item];}) .reduce(function(acc,item) { return acc + item; }); } document.write(sumProperties(obj));
给定的
var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional": 299}
var result = _.sum(obj);
如果您的某些值不是数字,则需要先将它们映射到数字:
var result = _.sum(_.map(obj, function(n){
return +n;
//or parseInt(n) or parseInt(n,10)
}));
你可以这样做:
var sum_object = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"};
var sum = 0;
for( var index in sum_object ){
sum += parseInt(sum_object[index]);
console.log("Val: ",sum_object[index], sum);
};
console.log(sum);
JSFiddle: http : //jsfiddle.net/abvuh5m0/
var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"};
function sum(obj){
var sum = 0;
for(var key in obj){
if (obj. hasOwnProperty(key)) {
sum += parseInt(obj[key]) || 0;
}
}
return sum
}
console.log(sum(obj));
parseInt(obj[key]) || 0;
重要 id 值不是数字
使用 Lodash:
var obj = {"speed":299,"equipment":49,"teleabb":49,"additional":50,"optional":"299"};
var val = _.sumBy(_.values(obj), function(v) {
return parseInt(v)
});
var sum = 0;
for(var key in objects) {
sum += parseInt(objects[key]);
}
console.log(sum);
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