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x/rambda/source/takeWhile.js

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import {_isArray} from '../src/_internals/_isArray'
export function takeWhile(predicate, iterable) { if (arguments.length === 1) { return _iterable => takeWhile(predicate, _iterable) } const isArray = _isArray(iterable) if (!isArray && typeof iterable !== 'string') { throw new Error('`iterable` is neither list nor a string') } let flag = true const holder = [] let counter = -1
while (counter++ < iterable.length - 1) { if (!predicate(iterable[counter])) { if (flag) flag = false } else if (flag) { holder.push(iterable[counter]) } } holder
return isArray ? holder : holder.join('')}