array

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理解计算机 ... javascript
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array

理解计算机/web/javascript

map

can traverse an array and return a new array

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<array>.map(function(element,index){
    element //array element
    index //array index
    return element + 10 //Can be modified
})

forEach

can traverse an array,but cannit return

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<array>.forEach(function(element,index){
    element //array element
    index //array index
})
  1. index optional

filter

can traverse an array and return a new array

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<array>.filter(function(element,index){
    element //array element
    index //array index
    return element > 10 //Can be compared
})

reduce

Return the cumulative processing result, used for summation

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<array>.reduce(function(prev,current){
    return prev + current
},<initial value>)

join

convert an array to a string

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<array>.join(["split symbol"])

if the split symbol is empty,it is comma separated