[英]Why is this javascript function returning undefined ?
let getLowerUpperBoundFromValue=(bound , idToValue)=>{
// Returns the value of the variable previously generated if "value" is a variable name or return "value" if its a number .
// bound : can be a direct integer or a variable name.
// idToValue : contains the id to value mapping which must contain a variable whose name must be equal to 'bound' parameter if its a variable name .
if(isNaN(Number(bound)))
{
Object.entries(idToVarStatesGlobal).forEach(idStatePair=>{
let id= idStatePair[0] , varState = idStatePair[1] ;
if(varState.name===bound){
console.log("check now Returning idTovalue[id]" , idToValue , id , idToValue[id] , Number(idToValue[id]));
return Number(idToValue[id]) ;
}
})
}
else return Number(bound);
}
當我做這樣的控制台日志時:
console.log('check now: ' , getLowerUpperBoundFromValue(varState.lowerbound , idToValue)) ;
我得到這樣的日志輸出:
check now Returning idTovalue[id] {PSfCL5hBm: 69} PSfCL5hBm 69 69
inputGeneration.js:99 check now: undefined
為什么即使Number(idTovalue[id])
值返回到正常值69,該函數也仍返回未定義狀態?
什么也沒有返回,因為forEach回調是一個單獨的方法。 我刪除了對.forEach
的調用,並用for of
循環替換了它,該循環維護了return
范圍
let getLowerUpperBoundFromValue=(bound , idToValue)=>{
// Returns the value of the variable previously generated if "value" is a variable name or return "value" if its a number .
// bound : can be a direct integer or a variable name.
// idToValue : contains the id to value mapping which must contain a variable whose name must be equal to 'bound' parameter if its a variable name .
if(isNaN(Number(bound)))
{
for (let idStatePair of Object.entries(idToVarStatesGlobal)) {
let id= idStatePair[0] , varState = idStatePair[1] ;
if(varState.name===bound){
console.log("check now Returning idTovalue[id]" , idToValue , id , idToValue[id] , Number(idToValue[id]));
return Number(idToValue[id]) ;
}
}
}
else return Number(bound);
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.