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  • every,some,filter,map数组方法区别

    /**
    * every()遍历数组,判断是否全部符合条件,只有全部满足才返回true,否则就false
    * some()遍历数组,判断是否有符合的,有一个符合就返回true,不再往后执行,和every相反
    * filter()遍历数组,判断是否有符合的,返回符合条件的数据组成的数组,不改变原数组
    * map()遍历数组,判断是否有符合条件的,返回数组,数组由true和false组成,不改变原数组
    **/

                let array=[1,2,4,7,9] , newArray=[] ;         
                let checNum =(current)=>current<2;
                // console.log("newArray:",array.every(checNum));
                console.log("newArray:",array.every(function(val){
                    console.log("vevery-al:",val);
                    return val>1;
                }));
                // console.log("array",array);
                console.log("some:",array.some(checNum));
                console.log("some:",array.some(function(value){
                    console.log("some-value:",value);
                    return value>1;
                }));
                console.log("filter:",array.filter(checNum));
                console.log("filter:",array.filter(function(value){
                    console.log("filter-value:",value);
                    return value>1;
                }));
                console.log("map:",array.map(function(value){
                    console.log("map-value",value);
                    return value>2;
                }));
                console.log(array)                         
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  • 原文地址:https://www.cnblogs.com/changyuqing/p/12807448.html
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