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- const __flattenReducer = (result,value,valueIndex,arr)=>{
- if(value instanceof Array){
- return value.reduce(__flattenReducer,result);
- }else{
- result.push(value);
- return result;
- }
- };
- const flatten = function(arr){
- if(arr instanceof Array){
- return Array.prototype.reduce.apply(arr,[__flattenReducer,[]]);
- }else{
- throw new TypeError('Expected an array');
- }
- }
- module.exports = flatten;
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